| perforation | (noun) the act of punching a hole (especially a row of holes as for ease of separation) | - |
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| (noun) a line of small holes for tearing at a particular place | - |
| (noun) a hole made in something | - |
| performance | (noun) the act of performing; of doing something successfully; using knowledge as distinguished from merely possessing it | Synonyms: carrying into action, carrying out, execution |
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| (noun) the act of presenting a play or a piece of music or other entertainment | - |
| (noun) any recognized accomplishment | - |
| (noun) a dramatic or musical entertainment | Synonyms: public presentation |
| (noun) process or manner of functioning or operating | Synonyms: functioning, operation |
| performer | (noun) an entertainer who performs a dramatic or musical work for an audience | Synonyms: performing artist |
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| performing | (noun) the performance of a part or role in a drama | Synonyms: acting, playacting, playing |
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| perfume | (noun) a toiletry that emits and diffuses a fragrant odor | Synonyms: essence |
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| (noun) a distinctive odor that is pleasant | Synonyms: aroma, fragrance, scent |
| perfumer | (noun) a person who makes (and sells) perfumes | - |
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| perfumery | (noun) the art of making perfumes | - |
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| (noun) an establishment where perfumes are made | - |
| (noun) store where perfumes are sold | - |
| (noun) perfumes in general | - |
| perfusion | (noun) pumping a liquid into an organ or tissue (especially by way of blood vessels) | - |
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| pitcherful | (noun) the quantity contained in a pitcher | Synonyms: pitcher |
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| pluperfect | (noun) a perfective tense used to express action completed in the past | Synonyms: past perfect, past perfect tense, pluperfect tense |
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| powerfulness | (noun) possession of controlling influence | Synonyms: power |
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| pufferfish | (noun) any of numerous marine fishes whose elongated spiny body can inflate itself with water or air to form a globe; several species contain a potent nerve poison; closely related to spiny puffers | Synonyms: blowfish, globefish, puffer |
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| (noun) delicacy that is highly dangerous because of a potent nerve poison in ovaries and liver | Synonyms: blowfish, puffer, sea squab |
| quarterfinal | (noun) one of the four competitions in an elimination tournament whose winners go on to play in the semifinals | - |
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| rudderfish | (noun) fish having the habit of following ships; found in North American and South American coastal waters | Synonyms: banded rudderfish, Seriola zonata |
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| (noun) food and game fish around Bermuda and Florida; often follow ships | Synonyms: Bermuda chub, Kyphosus sectatrix |
| rutherford | (noun) a unit strength of a radioactive source equal to one million disintegrations per second | - |
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| rutherfordium | (noun) a radioactive transuranic element which has been synthesized | Synonyms: atomic number 104, element 104, Rf, unnilquadium, Unq |
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| scarf | (noun) a garment worn around the head or neck or shoulders for warmth or decoration | - |
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| (noun) a joint made by notching the ends of two pieces of timber or metal so that they will lock together end-to-end | Synonyms: scarf joint |
| scarfpin | (noun) a pin used to hold the tie in place | Synonyms: tie tack, tiepin |
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| scurf | (noun) (botany) a covering that resembles scales or bran that covers some plant parts | - |
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| (noun) a thin flake of dead epidermis shed from the surface of the skin | Synonyms: exfoliation, scale |
| serf | (noun) (Middle Ages) a person who is bound to the land and owned by the feudal lord | Synonyms: helot, villein |
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| serfdom | (noun) the state of a serf | Synonyms: serfhood, vassalage |
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| serfhood | (noun) the state of a serf | Synonyms: serfdom, vassalage |
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| silverfish | (noun) a silvery variety of Carassius auratus | - |
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| (noun) silver-grey wingless insect found in houses feeding on book bindings and starched clothing | Synonyms: Lepisma saccharina |
| soldierfish | (noun) the larger squirrelfishes | Synonyms: soldier-fish |
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| spearfish | (noun) any of several large vigorous pelagic fishes resembling sailfishes but with first dorsal fin much reduced; worldwide but rare | - |
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| spiderflower | (noun) any of various often strong-smelling plants of the genus Cleome having showy spider-shaped flowers | Synonyms: cleome |
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| starfish | (noun) echinoderms characterized by five arms extending from a central disk | Synonyms: sea star |
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| starflower | (noun) common Old World herb having grasslike leaves and clusters of star-shaped white flowers with green stripes; naturalized in the eastern United States | Synonyms: Ornithogalum umbellatum, sleepy dick, summer snowflake |
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| subterfuge | (noun) something intended to misrepresent the true nature of an activity | Synonyms: blind |
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| suckerfish | (noun) marine fishes with a flattened elongated body and a sucking disk on the head for attaching to large fish or moving objects | Synonyms: remora, sucking fish |
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| suksdorfia | (noun) any of several American plants of the genus Suksdorfia having orbicular to kidney-shaped somewhat succulent leaves and white or rose or violet flowers in terminal panicles | - |
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| superfamily | (noun) (biology) a taxonomic group ranking below an order but above a family | - |
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| superfecta | (noun) a bet that you can pick the first four finishers in a race in the right order | - |
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| superfecundation | (noun) fertilization of two or more ova released during the same menstrual cycle by sperm from separate acts of coitus (especially by different males) | - |
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| superfetation | (noun) fertilization of a second ovum after a pregnancy has begun; results in two fetuses of different ages in the uterus at the same time | - |
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| superficiality | (noun) lack of depth of knowledge or thought or feeling | Synonyms: shallowness |
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| (noun) shallowness in terms of affecting only surface layers of something | - |
| superficies | (noun) outer surface of an area or a body | - |
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| (noun) the purely external aspect of a thing; superficial appearance | - |
| superfluity | (noun) extreme excess | Synonyms: embarrassment, overplus, plethora |
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| superfood | (noun) a food with health benefits | - |
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| surf | (noun) waves breaking on the shore | Synonyms: breaker, breakers |
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| surface | (noun) the outer boundary of an artifact or a material layer constituting or resembling such a boundary | - |
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| (noun) a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight | Synonyms: aerofoil, airfoil, control surface |
| (noun) a superficial aspect as opposed to the real nature of something | - |
| (noun) information that has become public | Synonyms: open |
| (noun) the extended two-dimensional outer boundary of a three-dimensional object | - |
| (noun) the outermost level of the land or sea | Synonyms: Earth's surface |
| surfacing | (noun) emerging to the surface and becoming apparent | - |
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| surfactant | (noun) a chemical agent capable of reducing the surface tension of a liquid in which it is dissolved | Synonyms: surface-active agent, wetter, wetting agent |
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| surfbird | (noun) sandpiper-like shorebird of Pacific coasts of North America and South America | Synonyms: Aphriza virgata |
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| surfboard | (noun) a narrow buoyant board for riding surf | - |
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| surfboarder | (noun) someone who engages in surfboarding | Synonyms: surfer |
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| surfboarding | (noun) the sport of riding a surfboard toward the shore on the crest of a wave | Synonyms: surfing, surfriding |
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| surfboat | (noun) a boat that can be launched or landed in heavy surf | - |
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| surfeit | (noun) eating until excessively full | Synonyms: repletion |
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| (noun) the quality of being so overabundant that prices fall | Synonyms: glut, oversupply |
| (noun) the state of being more than full | Synonyms: excess, overabundance |
| surfer | (noun) someone who engages in surfboarding | Synonyms: surfboarder |
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| surffish | (noun) small to medium-sized shallow-water fishes of the Pacific coast of North America | Synonyms: surf fish, surfperch |
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| (noun) a fish of the Pacific coast of North America | Synonyms: surf fish, Umbrina roncador, yellowfin croaker |
| surfing | (noun) the sport of riding a surfboard toward the shore on the crest of a wave | Synonyms: surfboarding, surfriding |
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| surfperch | (noun) small to medium-sized shallow-water fishes of the Pacific coast of North America | Synonyms: surf fish, surffish |
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| surfriding | (noun) the sport of riding a surfboard toward the shore on the crest of a wave | Synonyms: surfboarding, surfing |
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| tearfulness | (noun) sadness expressed by weeping | Synonyms: weepiness |
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| tenderfoot | (noun) an inexperienced person (especially someone inexperienced in outdoor living) | - |
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| triggerfish | (noun) any of numerous compressed deep-bodied tropical fishes with sandpapery skin and erectile spines in the first dorsal fin | - |
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| turf | (noun) range of jurisdiction or influence | - |
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| (noun) the territory claimed by a juvenile gang as its own | - |
| (noun) surface layer of ground containing a mat of grass and grass roots | Synonyms: greensward, sod, sward |
| uncheerfulness | (noun) not conducive to cheer or good spirits | - |
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| (noun) a feeling of dreary or pessimistic sadness | Synonyms: cheerlessness |
| underfelt | (noun) a carpet pad of thick felt | - |
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| underframe | (noun) the internal supporting structure that gives an artifact its shape | Synonyms: frame, skeletal frame, skeleton |
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| underfur | (noun) thick soft fur lying beneath the longer and coarser guard hair | Synonyms: undercoat |
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| underperformer | (noun) a business that is less successful than expected | - |
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| (noun) a student who does not perform as well as expected or as well as the IQ indicates | Synonyms: nonachiever, underachiever |
| undersurface | (noun) the lower side of anything | Synonyms: bottom, underside |
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| warfare | (noun) the waging of armed conflict against an enemy | Synonyms: war |
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| (noun) an active struggle between competing entities | Synonyms: war |
| warfarin | (noun) an anticoagulant (trade name Coumadin) use to prevent and treat a thrombus or embolus | Synonyms: Coumadin |
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| waterfall | (noun) a steep descent of the water of a river | Synonyms: falls |
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| waterfinder | (noun) forked stick that is said to dip down to indicate underground water or oil | Synonyms: divining rod, dowser, dowsing rod, water finder |
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| waterfowl | (noun) freshwater aquatic bird | Synonyms: water bird, waterbird |
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| waterfront | (noun) the area of a city (such as a harbor or dockyard) alongside a body of water | - |
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| wharf | (noun) a platform built out from the shore into the water and supported by piles; provides access to ships and boats | Synonyms: dock, pier, wharfage |
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| wharfage | (noun) a platform built out from the shore into the water and supported by piles; provides access to ships and boats | Synonyms: dock, pier, wharf |
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| (noun) a fee charged for the use of a wharf or quay | Synonyms: quayage |
| wonderfulness | (noun) admirable excellence | Synonyms: admirability, admirableness |
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| zarf | (noun) an ornamental metal cup-shaped holder for a hot coffee cup | - |
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