| mountainous | (adjective) like a mountain in size and impressiveness | - |
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| (adjective) having hills and crags | Synonyms: cragged, craggy, hilly |
| (adjective) containing many mountains | - |
| mountainside | (noun) the side or slope of a mountain | Synonyms: versant |
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| obtain | (verb) receive a specified treatment (abstract) | Synonyms: find, get, incur, receive |
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| (verb) come into possession of | - |
| (verb) be valid, applicable, or true | Synonyms: hold, prevail |
| obtainable | (adjective) capable of being obtained | Synonyms: getable, gettable, procurable |
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| obtainment | (noun) the act of obtaining | Synonyms: obtention |
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| oxtail | (noun) the skinned tail of cattle; used especially for soups | - |
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| pentail | (noun) brown tree shrew having a naked tail bilaterally fringed with long stiff hairs on the distal third; of Malaysia | Synonyms: pen-tail, pen-tailed tree shrew |
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| pertain | (verb) be a part or attribute of | Synonyms: appertain |
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| (verb) be relevant to | Synonyms: bear on, come to, concern, have to do with, refer, relate, touch, touch on |
| pertainym | (noun) meaning relating to or pertaining to | - |
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| photovoltaic | (adjective) producing a voltage when exposed to radiant energy (especially light) | - |
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| pigtail | (noun) a plait of braided hair | - |
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| pintail | (noun) long-necked river duck of the Old and New Worlds having elongated central tail feathers | Synonyms: Anas acuta, pin-tailed duck |
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| plantain | (noun) starchy banana-like fruit; eaten (always cooked) as a staple vegetable throughout the tropics | - |
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| (noun) a banana tree bearing hanging clusters of edible angular greenish starchy fruits; tropics and subtropics | Synonyms: Musa paradisiaca, plantain tree |
| (noun) any of numerous plants of the genus Plantago; mostly small roadside or dooryard weeds with elliptic leaves and small spikes of very small flowers; seeds of some used medicinally | - |
| ponytail | (noun) a hair style that draws the hair back so that it hangs down in back of the head like a pony's tail | - |
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| rattail | (noun) deep-sea fish with a large head and body and long tapering tail | Synonyms: grenadier, rattail fish |
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| redtail | (noun) dark brown American hawk species having a reddish-brown tail | Synonyms: Buteo jamaicensis, red-tailed hawk |
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| (noun) European songbird with a reddish breast and tail; related to Old World robins | Synonyms: redstart |
| retail | (noun) the selling of goods to consumers; usually in small quantities and not for resale | - |
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| (adverb) at a retail price | - |
| (verb) sell on the retail market | - |
| (verb) be sold at the retail level | - |
| retailer | (noun) a merchant who sells goods at retail | Synonyms: retail merchant |
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| retailing | (noun) the activities involved in selling commodities directly to consumers | - |
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| retain | (verb) keep in one's mind | - |
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| (verb) secure and keep for possible future use or application | Synonyms: hold, hold back, keep back |
| (verb) allow to remain in a place or position or maintain a property or feature | Synonyms: continue, keep, keep on |
| (verb) hold back within | - |
| retained | (adjective) continued in your keeping or use or memory | Synonyms: maintained |
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| retainer | (noun) a dental appliance that holds teeth (or a prosthesis) in position after orthodontic treatment | - |
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| (noun) a person working in the service of another (especially in the household) | Synonyms: servant |
| (noun) a fee charged in advance to retain the services of someone | Synonyms: consideration |
| ringtail | (noun) an immature golden eagle | - |
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| (noun) North American raccoon | Synonyms: common raccoon, common racoon, coon, Procyon lotor |
| (noun) raccoon-like omnivorous mammal of Mexico and the southwestern United States having a long bushy tail with black and white rings | Synonyms: Bassariscus astutus, bassarisk, cacomistle, cacomixle, civet cat, coon cat, miner's cat, raccoon fox, ring-tailed cat |
| (noun) monkey of Central America and South America having thick hair on the head that resembles a monk's cowl | Synonyms: capuchin, Cebus capucinus |
| scissortail | (noun) grey flycatcher of the southwestern United States and Mexico and Central America having a long forked tail and white breast and salmon and scarlet markings | Synonyms: Muscivora-forficata, scissortailed flycatcher |
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| secretaire | (noun) a desk used for writing | Synonyms: escritoire, secretary, writing table |
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| shirttail | (noun) fabric forming the tail of a shirt | - |
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| (noun) a brief addendum at the end of a newspaper article | - |
| solitaire | (noun) a card game played by one person | Synonyms: patience |
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| (noun) a dull grey North American thrush noted for its beautiful song | - |
| (noun) extinct flightless bird related to the dodo | Synonyms: Pezophaps solitaria |
| (noun) a gem (usually a diamond) in a setting by itself | - |
| sprigtail | (noun) large grouse of prairies and open forests of western North America | Synonyms: Pedioecetes phasianellus, sharp-tailed grouse, sprig tail |
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| springtail | (noun) any of numerous minute wingless primitive insects possessing a special abdominal appendage that allows the characteristic nearly perpetual springing pattern; found in soil rich in organic debris or on the surface of snow or water | Synonyms: collembolan |
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| squaretail | (noun) sluggish square-tailed fish armored with tough bony scales; of deep warm waters | - |
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| staid | (adjective) characterized by dignity and propriety | Synonyms: sedate |
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| staidly | (adverb) in a grave and sober manner | Synonyms: gravely, soberly |
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| staidness | (noun) a trait of dignified seriousness | Synonyms: sedateness, solemness, solemnity |
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| stain | (noun) an act that brings discredit to the person who does it | Synonyms: blot, smear, smirch, spot |
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| (noun) a soiled or discolored appearance | Synonyms: discoloration, discolouration |
| (noun) a symbol of disgrace or infamy | Synonyms: brand, mark, stigma |
| (noun) anything regarded as making something unclean | Synonyms: dirt, filth, grease, grime, grunge, soil |
| (noun) (microscopy) a dye or other coloring material that is used in microscopy to make structures visible | - |
| (verb) produce or leave stains | - |
| (verb) color with a liquid dye or tint | - |
| (verb) color for microscopic study | Synonyms: dye |
| (verb) make dirty or spotty, as by exposure to air; also used metaphorically | Synonyms: defile, maculate, sully, tarnish |
| stainability | (noun) (cytology) the capacity of cells or cell parts to stain specifically with certain dyes | - |
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| stainable | (adjective) capable of being stained (especially of cells and cell parts) | - |
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| stained | (adjective) marked or dyed or discolored with foreign matter | - |
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| (adjective) having a coating of stain or varnish | Synonyms: varnished |
| stainer | (noun) a worker who stains (wood or fabric) | - |
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| staining | (noun) (histology) the use of a dye to color specimens for microscopic study | - |
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| (noun) the act of spotting or staining something | Synonyms: maculation, spotting |
| stainless | (adjective) (of reputation) free from blemishes | Synonyms: unstained, unsullied, untainted, untarnished |
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| (noun) steel containing chromium that makes it resistant to corrosion | Synonyms: chromium steel, stainless steel |
| stair | (noun) support consisting of a place to rest the foot while ascending or descending a stairway | Synonyms: step |
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| staircase | (noun) a way of access (upward and downward) consisting of a set of steps | Synonyms: stairway |
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| stairhead | (noun) platform at the top of a staircase | - |
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| stairs | (noun) a flight of stairs or a flight of steps | Synonyms: steps |
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| stairway | (noun) a way of access (upward and downward) consisting of a set of steps | Synonyms: staircase |
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| stairwell | (noun) a vertical well around which there is a stairway | - |
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| sustain | (verb) undergo (as of injuries and illnesses) | Synonyms: get, have, suffer |
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| (verb) establish or strengthen as with new evidence or facts | Synonyms: affirm, confirm, corroborate, substantiate, support |
| (verb) admit as valid | - |
| (verb) supply with necessities and support | Synonyms: keep, maintain |
| (verb) provide with nourishment | Synonyms: nourish, nurture |
| (verb) be the physical support of; carry the weight of | Synonyms: hold, hold up, support |
| (verb) lengthen or extend in duration or space | Synonyms: keep up, prolong |
| sustainability | (noun) the property of being sustainable | - |
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| sustainable | (adjective) capable of being sustained | - |
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| sustained | (adjective) maintained at length without interruption or weakening | - |
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| (adjective) (of an electric arc) continuous | Synonyms: free burning |
| sustainer | (noun) someone who upholds or maintains | Synonyms: maintainer, upholder |
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| sustainment | (noun) the act of sustaining life by food or providing a means of subsistence | Synonyms: maintenance, sustenance, sustentation, upkeep |
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| swallowtail | (noun) a man's full-dress jacket with two long tapering tails at the back | Synonyms: morning coat, swallow-tailed coat |
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| swordtail | (noun) freshwater fish of Central America having a long swordlike tail; popular aquarium fish | Synonyms: helleri, topminnow, Xyphophorus helleri |
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| taichi | (noun) a Chinese system of slow meditative physical exercise designed for relaxation and balance and health | Synonyms: t'ai chi, t'ai chi chuan, tai chi, tai chi chuan, taichichuan |
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| taichichuan | (noun) a Chinese system of slow meditative physical exercise designed for relaxation and balance and health | Synonyms: t'ai chi, t'ai chi chuan, tai chi, tai chi chuan, taichi |
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| tail | (noun) the posterior part of the body of a vertebrate especially when elongated and extending beyond the trunk or main part of the body | - |
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| (noun) the rear part of a ship | Synonyms: after part, poop, quarter, stern |
| (noun) the rear part of an aircraft | Synonyms: empennage, tail assembly |
| (noun) (usually plural) the reverse side of a coin that does not bear the representation of a person's head | - |
| (noun) the fleshy part of the human body that you sit on | Synonyms: arse, ass, backside, behind, bottom, bum, buns, butt, buttocks, can, derriere, fanny, fundament, hind end, hindquarters, keister, nates, posterior, prat, rear, rear end, rump, seat, stern, tail end, tooshie, tush |
| (noun) a spy employed to follow someone and report their movements | Synonyms: shadow, shadower |
| (noun) any projection that resembles the tail of an animal | Synonyms: tail end |
| (noun) the time of the last part of something | Synonyms: fag end, tail end |
| (verb) remove or shorten the tail of an animal | Synonyms: bob, dock |
| (verb) remove the stalk of fruits or berries | - |
| (verb) go after with the intent to catch | Synonyms: chase, chase after, dog, give chase, go after, tag, track, trail |
| tailback | (noun) (American football) the position of the offensive back on a football team who lines up farthest from the line of scrimmage | - |
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| (noun) (American football) the person who plays tailback | - |
| tailband | (noun) an endband along the bottom edge of the book (as a book is standing upright). | - |
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| tailboard | (noun) a gate at the rear of a vehicle; can be lowered for loading | Synonyms: tailgate |
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| tailcoat | (noun) formalwear consisting of full evening dress for men | Synonyms: dress suit, full dress, tail coat, tails, white tie, white tie and tails |
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| tailed | (adjective) having a tail of a specified kind; often used in combination | - |
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| tailfin | (noun) a stabilizer that is part of the vertical tail structure of an airplane | Synonyms: tail fin, vertical fin, vertical stabiliser, vertical stabilizer |
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| (noun) one of a pair of decorations projecting above the rear fenders of an automobile | Synonyms: fin, tail fin |
| tailflower | (noun) any of various tropical American plants cultivated for their showy foliage and flowers | Synonyms: anthurium, tail-flower |
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| tailgate | (noun) a gate at the rear of a vehicle; can be lowered for loading | Synonyms: tailboard |
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| (verb) follow at a dangerously close distance | - |
| tailgater | (noun) a driver who follows too closely behind another motor vehicle | - |
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| tailing | (noun) the act of following someone secretly | Synonyms: shadowing |
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| tailless | (adjective) not having a tail | Synonyms: anurous |
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| taillight | (noun) lamp (usually red) mounted at the rear of a motor vehicle | Synonyms: rear lamp, rear light, tail lamp |
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| taillike | (adjective) resembling a tail | Synonyms: caudal |
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| tailor | (noun) a person whose occupation is making and altering garments | Synonyms: sartor, seamster |
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| (verb) adjust to a specific need or market | Synonyms: orient |
| (verb) create (clothes) with cloth | Synonyms: sew, tailor-make |
| (verb) style and tailor in a certain fashion | Synonyms: cut |
| tailorbird | (noun) tropical Asian warbler that stitches leaves together to form and conceal its nest | Synonyms: Orthotomus sutorius |
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| tailored | (adjective) (of clothing) custom-made | Synonyms: bespoke, bespoken, made-to-order, tailor-made |
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| (adjective) severely simple in line or design | Synonyms: trim |
| tailoring | (noun) the occupation of a tailor | - |
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| tailpiece | (noun) appendage added to extend the length of something | - |
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| tailpipe | (noun) a pipe carrying fumes from the muffler to the rear of a car | - |
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| tailplane | (noun) the horizontal airfoil of an aircraft's tail assembly that is fixed and to which the elevator is hinged | Synonyms: horizontal stabiliser, horizontal stabilizer |
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| tailrace | (noun) a watercourse that carries water away from a mill or water wheel or turbine | - |
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| tails | (noun) formalwear consisting of full evening dress for men | Synonyms: dress suit, full dress, tail coat, tailcoat, white tie, white tie and tails |
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| tailspin | (noun) rapid descent of an aircraft in a steep spiral | Synonyms: spin |
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| (noun) loss of emotional control often resulting in emotional collapse | - |
| tailstock | (noun) support consisting of the movable part of a lathe that slides along the bed in alignment with the headstock and is locked into position to support the free end of the workpiece | - |
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| tailwind | (noun) wind blowing in the same direction as the path of a ship or aircraft | - |
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| tailwort | (noun) hairy blue-flowered European annual herb long used in herbal medicine and eaten raw as salad greens or cooked like spinach | Synonyms: borage, Borago officinalis |
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| taint | (noun) the state of being contaminated | Synonyms: contamination |
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| (verb) contaminate with a disease or microorganism | Synonyms: infect |
| (verb) place under suspicion or cast doubt upon | Synonyms: cloud, corrupt, defile, sully |
| tainted | (adjective) touched by rot or decay | Synonyms: corrupt |
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| taipan | (noun) large highly venomous snake of northeastern Australia | Synonyms: Oxyuranus scutellatus |
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| taira | (noun) long-tailed arboreal mustelid of Central America and South America | Synonyms: Eira barbara, tayra |
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| telsontail | (noun) any of several minute primitive wingless and eyeless insects having a cone-shaped head; inhabit damp soil or decaying organic matter | Synonyms: proturan |
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| tripletail | (noun) large food fish of warm waters worldwide having long anal and dorsal fins that with a caudal fin suggest a three-lobed tail | - |
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| unascertainable | (adjective) not able to be ascertained; resisting discovery | Synonyms: undiscoverable |
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| unattainability | (noun) The fact of being unattainable, of not being able to be reached or acquired. | - |
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| unattainable | (adjective) impossible to achieve | Synonyms: unachievable, undoable, unrealizable |
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| unattainableness | (noun) the state of being unattainable | - |
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| unattainably | (adverb) in an unattainable manner or to an unattainable degree | Synonyms: unachievably |
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| uncertain | (adjective) not established beyond doubt; still undecided or unknown | - |
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| (adjective) lacking or indicating lack of confidence or assurance | Synonyms: incertain, unsure |
| (adjective) not certain to occur; not inevitable | - |
| (adjective) not established or confirmed | Synonyms: unsealed |
| (adjective) ambiguous (especially in the negative) | - |
| (adjective) not consistent or dependable | - |
| (adjective) subject to change | Synonyms: changeable, unsettled |
| uncertainly | (adverb) showing lack of certainty | - |
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| (adverb) in an unsteady manner | Synonyms: falteringly, unsteadily |
| uncertainness | (noun) being unsettled or in doubt or dependent on chance | Synonyms: precariousness, uncertainty |
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| uncertainty | (noun) being unsettled or in doubt or dependent on chance | Synonyms: precariousness, uncertainness |
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| (noun) the state of being unsure of something | Synonyms: doubt, doubtfulness, dubiety, dubiousness, incertitude |
| uncurtained | (adjective) not provided with curtains | Synonyms: curtainless |
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| unobtainable | (adjective) not capable of being obtained | Synonyms: inaccessible, unprocurable, untouchable |
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