| oxidoreductase | (noun) an enzyme that catalyzes oxidation-reduction | - |
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| oxygenase | (noun) an oxidoreductase that catalyzes the incorporation of molecular oxygen | - |
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| packhorse | (noun) a workhorse used as a pack animal | - |
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| packinghouse | (noun) a plant where livestock are slaughtered and processed and packed as meat products | Synonyms: packing plant |
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| (noun) a building where foodstuffs are processed and packed | - |
| paillasse | (noun) mattress consisting of a thin pad filled with straw or sawdust | Synonyms: palliasse |
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| palliasse | (noun) mattress consisting of a thin pad filled with straw or sawdust | Synonyms: paillasse |
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| pantyhose | (noun) a woman's tights consisting of underpants and stockings | - |
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| papoose | (noun) an American Indian infant | Synonyms: pappoose |
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| pappoose | (noun) an American Indian infant | Synonyms: papoose |
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| paradise | (noun) any place of complete bliss and delight and peace | Synonyms: Eden, heaven, nirvana, promised land, Shangri-la |
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| paraphrase | (noun) rewording for the purpose of clarification | Synonyms: paraphrasis |
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| pause | (noun) temporary inactivity | - |
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| (noun) a time interval during which there is a temporary cessation of something | Synonyms: break, intermission, interruption, suspension |
| pavise | (noun) (Middle Ages) a large heavy oblong shield protecting the whole body; originally carried but sometimes set up in permanent position | Synonyms: pavis |
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| pelisse | (noun) a sleeveless cape that is lined or trimmed with fur | - |
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| penicillinase | (noun) enzyme produced by certain bacteria that inactivates penicillin and results in resistance to that antibiotic | Synonyms: beta-lactamase |
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| penthouse | (noun) an apartment located on the top floors of a building | - |
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| pentose | (noun) any monosaccharide sugar containing five atoms of carbon per molecule | - |
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| peptidase | (noun) any enzyme that catalyzes the splitting of proteins into smaller peptide fractions and amino acids by a process known as proteolysis | Synonyms: protease, proteinase, proteolytic enzyme |
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| periclase | (noun) a white solid mineral that occurs naturally as periclase; a source of magnesium | Synonyms: magnesia, magnesium oxide |
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| peroxidase | (noun) any of a group of enzymes (occurring especially in plant cells) that catalyze the oxidation of a compound by a peroxide | - |
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| pesthouse | (noun) hospital for persons with infectious diseases (especially leprosy) | Synonyms: lazar house, lazaret, lazarette, lazaretto |
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| phase | (noun) (astronomy) the particular appearance of a body's state of illumination (especially one of the recurring shapes of the part of Earth's moon that is illuminated by the sun) | - |
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| (noun) (physical chemistry) a distinct state of matter in a system; matter that is identical in chemical composition and physical state and separated from other material by the phase boundary | Synonyms: form |
| (noun) any distinct time period in a sequence of events | Synonyms: stage |
| (noun) a particular point in the time of a cycle; measured from some arbitrary zero and expressed as an angle | Synonyms: phase angle |
| phosphatase | (noun) any of a group of enzymes that act as a catalyst in the hydrolysis of organic phosphates | - |
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| phrase | (noun) dance movements that are linked in a single choreographic sequence | - |
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| (noun) an expression consisting of one or more words forming a grammatical constituent of a sentence | - |
| (noun) a short musical passage | Synonyms: musical phrase |
| (noun) an expression whose meanings cannot be inferred from the meanings of the words that make it up | Synonyms: idiom, idiomatic expression, phrasal idiom, set phrase |
| pillowcase | (noun) bed linen consisting of a cover for a pillow | Synonyms: case, pillow slip, slip |
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| pilothouse | (noun) an enclosed compartment from which a vessel can be navigated | Synonyms: wheelhouse |
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| pithouse | (noun) a shelter for humans or domesticated animals and livestock based on a hole or depression dug into the ground; can be fully recessed into the earth, with a flat roof covered by ground, semi-recessed, with a constructed wood or sod roof standing out, or dug into a hillside. | Synonyms: dug-out, dugout, pit-house |
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| plagioclase | (noun) any of a series of triclinic feldspars that form rocks | Synonyms: oligoclase |
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| playhouse | (noun) plaything consisting of a small model of a house that children can play inside of | Synonyms: wendy house |
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| poise | (noun) great coolness and composure under strain | Synonyms: aplomb, assuredness, cool, sang-froid |
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| (noun) a cgs unit of dynamic viscosity equal to one dyne-second per square centimeter; the viscosity of a fluid in which a force of one dyne per square centimeter maintains a velocity of 1 centimeter per second | - |
| (noun) a state of being balanced in a stable equilibrium | - |
| politesse | (noun) courtesy towards women | Synonyms: chivalry, gallantry |
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| polonaise | (noun) a woman's dress with a tight bodice and an overskirt drawn back to reveal a colorful underskirt | - |
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| polymerase | (noun) an enzyme that catalyzes the formation of new DNA and RNA from an existing strand of DNA or RNA | - |
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| polyose | (noun) any of a class of carbohydrates whose molecules contain chains of monosaccharide molecules | Synonyms: polysaccharide |
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| poorhouse | (noun) an establishment maintained at public expense in order to provide housing for the poor and homeless | - |
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| porpoise | (noun) any of several small gregarious cetacean mammals having a blunt snout and many teeth | - |
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| porterhouse | (noun) large steak from the thick end of the short loin containing a T-shaped bone and large piece of tenderloin | Synonyms: porterhouse steak |
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| pose | (noun) a deliberate pretense or exaggerated display | Synonyms: affectation, affectedness, mannerism |
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| (noun) affected manners intended to impress others | Synonyms: airs |
| (noun) a posture assumed by models for photographic or artistic purposes | - |
| poseuse | (noun) a woman poseur | - |
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| posse | (noun) a temporary police force | Synonyms: posse comitatus |
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| posthouse | (noun) an inn for exchanging post horses and accommodating riders | Synonyms: post house |
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| pothouse | (noun) tavern consisting of a building with a bar and public rooms; often provides light meals | Synonyms: gin mill, pub, public house, saloon, taphouse |
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| powerhouse | (noun) an electrical generating station | Synonyms: power plant, power station |
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| (noun) a team considered to be the best of its class | - |
| (noun) a highly energetic and indefatigable person | Synonyms: ball of fire, fireball, human dynamo |
| praise | (noun) an expression of approval and commendation | Synonyms: congratulations, extolment, kudos |
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| (noun) offering words of homage as an act of worship | - |
| premise | (noun) a statement that is assumed to be true and from which a conclusion can be drawn | Synonyms: assumption, premiss |
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| pretense | (noun) the act of giving a false appearance | Synonyms: feigning, pretence, pretending, simulation |
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| (noun) a false or unsupportable quality | Synonyms: pretence, pretension |
| (noun) an artful or simulated semblance | Synonyms: guise, pretence, pretext |
| (noun) imaginative intellectual play | Synonyms: make-believe, pretence |
| (noun) pretending with intention to deceive | Synonyms: dissembling, feigning, pretence |
| primrose | (noun) any of numerous short-stemmed plants of the genus Primula having tufted basal leaves and showy flowers clustered in umbels or heads | Synonyms: primula |
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| prolapse | (noun) the slipping or falling out of place of an organ (as the uterus) | Synonyms: descensus, prolapsus |
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| promise | (noun) grounds for feeling hopeful about the future | Synonyms: hope |
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| (noun) a verbal commitment by one person to another agreeing to do (or not to do) something in the future | - |
| prophase | (noun) the first stage of mitosis | - |
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| (noun) the first stage of meiosis | - |
| prose | (noun) ordinary writing as distinguished from verse | - |
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| (noun) matter of fact, commonplace, or dull expression | - |
| protease | (noun) any enzyme that catalyzes the splitting of proteins into smaller peptide fractions and amino acids by a process known as proteolysis | Synonyms: peptidase, proteinase, proteolytic enzyme |
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| proteinase | (noun) any enzyme that catalyzes the splitting of proteins into smaller peptide fractions and amino acids by a process known as proteolysis | Synonyms: peptidase, protease, proteolytic enzyme |
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| prothrombinase | (noun) coagulation factor that is converted to an enzyme that converts prothrombin to thrombin in a reaction that depends on calcium ions and other coagulation factors | Synonyms: factor X |
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| pulse | (noun) the rhythmic contraction and expansion of the arteries with each beat of the heart | Synonyms: beat, heartbeat, pulsation |
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| (noun) (electronics) a sharp transient wave in the normal electrical state (or a series of such transients) | Synonyms: impulse, pulsation, pulsing |
| (noun) edible seeds of various pod-bearing plants (peas or beans or lentils etc.) | - |
| (noun) the rate at which the heart beats; usually measured to obtain a quick evaluation of a person's health | Synonyms: heart rate, pulse rate |
| purchase | (noun) the acquisition of something for payment | - |
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| (noun) the mechanical advantage gained by being in a position to use a lever | Synonyms: leverage |
| (noun) a means of exerting influence or gaining advantage | - |
| (noun) something acquired by purchase | - |
| purpose | (noun) what something is used for | Synonyms: function, role, use |
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| (noun) the quality of being determined to do or achieve something; firmness of purpose | Synonyms: determination |
| (noun) an anticipated outcome that is intended or that guides your planned actions | Synonyms: aim, design, intent, intention |
| purse | (noun) a container used for carrying money and small personal items or accessories (especially by women) | Synonyms: bag, handbag, pocketbook |
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| (noun) a small bag for carrying money | - |
| (noun) a sum of money offered as a prize | - |
| (noun) a sum of money spoken of as the contents of a money purse | - |
| pyocyanase | (noun) a yellow-green mixture of antibiotics obtained from the bacillus of green pus | - |
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| pyrocellulose | (noun) nitrocellulose containing less nitrogen than guncotton; used in making smokeless powder | - |
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| racecourse | (noun) a course over which races are run | Synonyms: racetrack, raceway, track |
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| racehorse | (noun) a horse bred for racing | Synonyms: bangtail, race horse |
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| raffinose | (noun) a trisaccharide that occurs in sugar beets and cotton seeds and certain cereals | - |
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| raise | (noun) the act of raising something | Synonyms: heave, lift |
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| (noun) increasing the size of a bet (as in poker) | - |
| (noun) the amount a salary is increased | Synonyms: hike, rise, salary increase, wage hike, wage increase |
| (noun) an upward slope or grade (as in a road) | Synonyms: acclivity, ascent, climb, rise, upgrade |
| recluse | (noun) one who lives in solitude | Synonyms: hermit, solitary, solitudinarian, troglodyte |
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| recompense | (noun) the act of compensating for service or loss or injury | Synonyms: compensation |
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| (noun) payment or reward (as for service rendered) | - |
| recourse | (noun) act of turning to for assistance | Synonyms: refuge, resort |
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| (noun) something or someone turned to for assistance or security | Synonyms: refuge, resort |
| redhorse | (noun) North American sucker with reddish fins | Synonyms: redhorse sucker |
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| reductase | (noun) an enzyme that catalyses the biochemical reduction of some specified substance | - |
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| refuse | (noun) food that is discarded (as from a kitchen) | Synonyms: food waste, garbage, scraps |
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| relapse | (noun) a failure to maintain a higher state | Synonyms: backsliding, lapse, lapsing, relapsing, reversion, reverting |
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| release | (noun) activity that frees or expresses creative energy or emotion | Synonyms: outlet, vent |
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| (noun) the act of liberating someone or something | Synonyms: freeing, liberation |
| (noun) the termination of someone's employment (leaving them free to depart) | Synonyms: discharge, dismissal, dismission, firing, liberation, sack, sacking |
| (noun) the act of allowing a fluid to escape | Synonyms: spill, spillage |
| (noun) a formal written statement of relinquishment | Synonyms: discharge, waiver |
| (noun) (music) the act or manner of terminating a musical phrase or tone | Synonyms: tone ending |
| (noun) merchandise issued for sale or public showing (especially a record or film) | - |
| (noun) a device that when pressed will release part of a mechanism | Synonyms: button |
| (noun) an announcement distributed to members of the press in order to supplement or replace an oral presentation | Synonyms: handout, press release |
| (noun) a legal document evidencing the discharge of a debt or obligation | Synonyms: acquittance |
| (noun) euphemistic expressions for death | Synonyms: departure, exit, expiration, going, loss, passing |
| (noun) a process that liberates or discharges something | - |
| remise | (noun) (fencing) a second thrust made on the same lunge (as when your opponent fails to riposte) | - |
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| (noun) a small building for housing coaches and carriages and other vehicles | Synonyms: carriage house, coach house |
| (noun) an expensive or high-class hackney | - |
| remorse | (noun) a feeling of deep regret (usually for some misdeed) | Synonyms: compunction, self-reproach |
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| repose | (noun) freedom from activity (work or strain or responsibility) | Synonyms: ease, relaxation, rest |
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| (noun) a disposition free from stress or emotion | Synonyms: placidity, quiet, serenity, tranquility, tranquillity |
| (noun) the absence of mental stress or anxiety | Synonyms: ataraxis, heartsease, peace, peace of mind, peacefulness, serenity |
| repulse | (noun) an instance of driving away or warding off | Synonyms: rebuff, snub |
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| repurchase | (noun) the act of purchasing back something previously sold | Synonyms: buyback, redemption |
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| response | (noun) a bodily process occurring due to the effect of some antecedent stimulus or agent | Synonyms: reaction |
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| (noun) the manner in which an electrical or mechanical device responds to an input signal or a range of input signals | - |
| (noun) the speech act of continuing a conversational exchange | Synonyms: reply |
| (noun) a statement (either spoken or written) that is made to reply to a question or request or criticism or accusation | Synonyms: answer, reply |
| (noun) the manner in which something is greeted | Synonyms: reception |
| (noun) a phrase recited or sung by the congregation following a versicle by the priest or minister | - |
| (noun) a result | - |
| reverse | (noun) (American football) a running play in which a back running in one direction hands the ball to a back running in the opposite direction | - |
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| (noun) turning in the opposite direction | Synonyms: reversal, reversion, turnabout, turnaround |
| (noun) the gears by which the motion of a machine can be reversed | Synonyms: reverse gear |
| (noun) the side of a coin or medal that does not bear the principal design | Synonyms: verso |
| (noun) an unfortunate happening that hinders or impedes; something that is thwarting or frustrating | Synonyms: black eye, blow, reversal, setback |
| (noun) a relation of direct opposition | Synonyms: contrary, opposite |
| revise | (noun) the act of rewriting something | Synonyms: rescript, revisal, revision |
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| ribonuclease | (noun) a transferase that catalyzes the hydrolysis of ribonucleic acid | Synonyms: ribonucleinase, RNase |
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| ribonucleinase | (noun) a transferase that catalyzes the hydrolysis of ribonucleic acid | Synonyms: ribonuclease, RNase |
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| ribose | (noun) a pentose sugar important as a component of ribonucleic acid | - |
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| rinse | (noun) washing lightly without soap | - |
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| (noun) the act of giving a light tint to the hair | - |
| (noun) the removal of soap with clean water in the final stage of washing | Synonyms: rinsing |
| (noun) a liquid preparation used on wet hair to give it a tint | - |
| rise | (noun) the act of changing location in an upward direction | Synonyms: ascending, ascension, ascent |
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| (noun) increase in price or value | Synonyms: advance |
| (noun) the property possessed by a slope or surface that rises | Synonyms: rising slope, upgrade |
| (noun) the amount a salary is increased | Synonyms: hike, raise, salary increase, wage hike, wage increase |
| (noun) an increase in cost | Synonyms: boost, cost increase, hike |
| (noun) a growth in strength or number or importance | - |
| (noun) a wave that lifts the surface of the water or ground | Synonyms: lift |
| (noun) a movement upward; rise above the ground | Synonyms: ascension, ascent, rising |
| (noun) (theology) the origination of the Holy Spirit at Pentecost | Synonyms: emanation, procession |
| (noun) an upward slope or grade (as in a road) | Synonyms: acclivity, ascent, climb, raise, upgrade |
| roadhouse | (noun) an inn (usually outside city limits on a main road) providing meals and liquor and dancing and (sometimes) gambling | - |
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| rockrose | (noun) small shrubs of scrub and dry woodland regions of southern Europe and North Africa; grown for their showy flowers and soft often downy and aromatic evergreen foliage | Synonyms: rock rose |
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| (noun) any of numerous varieties of helianthemums having small rose-like yellow or white or reddish flowers | Synonyms: rock rose |
| rose | (noun) a dusty pink color | Synonyms: rosiness |
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| (noun) pinkish table wine from red grapes whose skins were removed after fermentation began | Synonyms: blush wine, pink wine, rose wine |
| (noun) any of many shrubs of the genus Rosa that bear roses | Synonyms: rosebush |
| roundhouse | (noun) a hook delivered with an exaggerated swing | - |
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| (noun) workplace consisting of a circular building for repairing locomotives | - |
| ruse | (noun) a deceptive maneuver (especially to avoid capture) | Synonyms: artifice |
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| saccharase | (noun) an enzyme that catalyzes the hydrolysis of sucrose into glucose and fructose | Synonyms: invertase, sucrase |
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| saccharose | (noun) a complex carbohydrate found in many plants and used as a sweetening agent | Synonyms: sucrose |
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| sandgrouse | (noun) pigeon-like bird of arid regions of the Old World having long pointed wings and tail and precocial downy young | Synonyms: sand grouse |
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| sawhorse | (noun) a framework for holding wood that is being sawed | Synonyms: buck, horse, sawbuck |
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| schmoose | (noun) an informal conversation | Synonyms: chat, confab, confabulation, schmooze |
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| schoolhouse | (noun) a building where young people receive education | Synonyms: school |
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| scouse | (noun) a stew of meat and vegetables and hardtack that is eaten by sailors | Synonyms: lobscouse, lobscuse |
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| seahorse | (noun) small fish with horse-like heads bent sharply downward and curled tails; swim in upright position | Synonyms: sea horse |
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| (noun) either of two large northern marine mammals having ivory tusks and tough hide over thick blubber | Synonyms: sea horse, walrus |
| secretase | (noun) a set of enzymes believed to snip pieces off a longer protein producing fragments of amyloid protein that bunch up and create amyloid protein plaques in brain tissue (the pathological hallmark of Alzheimer's) | - |
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| seedcase | (noun) the vessel that contains the seeds of a plant (not the seeds themselves) | Synonyms: cod, pod |
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