| aardvark | (noun) nocturnal burrowing mammal of the grasslands of Africa that feeds on termites; sole extant representative of the order Tubulidentata | Synonyms: ant bear, anteater, Orycteropus afer |
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| antiquark | (noun) the antiparticle of a quark | - |
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| ark | (noun) a boat built by Noah to save his family and animals from the flood | - |
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| ballpark | (noun) a facility in which ball games are played (especially baseball games) | Synonyms: park |
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| (noun) near to the scope or range of something | Synonyms: approximate range |
| bark | (noun) a sailing ship with 3 (or more) masts | Synonyms: barque |
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| (noun) the sound made by a dog | - |
| (noun) a noise resembling the bark of a dog | - |
| (noun) tough protective covering of the woody stems and roots of trees and other woody plants | - |
| benchmark | (noun) a standard by which something can be measured or judged | - |
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| (noun) a surveyor's mark on a permanent object of predetermined position and elevation used as a reference point | Synonyms: bench mark |
| birchbark | (noun) a canoe made with the bark of a birch tree | Synonyms: birch bark, birchbark canoe |
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| birthmark | (noun) a blemish on the skin that is formed before birth | Synonyms: nevus |
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| bismark | (noun) a raised doughnut filled with jelly or jam | Synonyms: Berlin doughnut, jelly doughnut |
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| bookmark | (noun) a marker (a piece of paper or ribbon) placed between the pages of a book to mark the reader's place | Synonyms: bookmarker |
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| bulwark | (noun) a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away | Synonyms: breakwater, groin, groyne, jetty, mole, seawall |
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| (noun) an embankment built around a space for defensive purposes | Synonyms: rampart, wall |
| (noun) a fencelike structure around a deck | - |
| crampbark | (noun) deciduous thicket-forming Old World shrub with clusters of white flowers and small bright red berries | Synonyms: cranberry tree, European cranberry bush, European cranberrybush, guelder rose, Viburnum opulus |
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| dark | (noun) an unenlightened state | Synonyms: darkness |
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| (noun) an unilluminated area | Synonyms: darkness, shadow |
| (noun) absence of light or illumination | Synonyms: darkness |
| (noun) absence of moral or spiritual values | Synonyms: darkness, wickedness |
| (noun) the time after sunset and before sunrise while it is dark outside | Synonyms: night, nighttime |
| earmark | (noun) a distinctive characteristic or attribute of someone or something | Synonyms: hallmark, stylemark, trademark |
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| (noun) identification mark on the ear of a domestic animal | - |
| fingermark | (noun) a smudge made by a (dirty) finger | Synonyms: fingerprint |
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| footmark | (noun) a mark of a foot or shoe on a surface | Synonyms: footprint, step |
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| hallmark | (noun) a distinctive characteristic or attribute of someone or something | Synonyms: earmark, stylemark, trademark |
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| (noun) a mark on an article of trade to indicate its origin and authenticity | Synonyms: assay-mark, authentication |
| hashmark | (noun) an insignia worn to indicate years of service | Synonyms: hash mark, service stripe |
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| lacebark | (noun) small tree or shrub of New Zealand having a profusion of axillary clusters of honey-scented paper-white flowers and whose bark is used for cordage | Synonyms: Hoheria populnea, houhere, ribbonwood |
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| landmark | (noun) an anatomical structure used as a point of origin in locating other anatomical structures (as in surgery) or as point from which measurements can be taken | - |
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| (noun) a mark showing the boundary of a piece of land | - |
| (noun) an event marking a unique or important historical change of course or one on which important developments depend | Synonyms: turning point, watershed |
| (noun) the position of a prominent or well-known object in a particular landscape | - |
| lark | (noun) any carefree episode | Synonyms: escapade |
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| (noun) any of numerous predominantly Old World birds noted for their singing | - |
| (noun) a songbird that lives mainly on the ground in open country; has streaky brown plumage | Synonyms: pipit, titlark |
| (noun) North American songbirds having a yellow breast | Synonyms: meadowlark |
| mark | (noun) something that exactly succeeds in achieving its goal | Synonyms: bell ringer, bull's eye, home run |
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| (noun) an indication of damage | Synonyms: scar, scrape, scratch |
| (noun) a marking that consists of lines that cross each other | Synonyms: crisscross, cross |
| (noun) the impression created by doing something unusual or extraordinary that people notice and remember | - |
| (noun) a number or letter indicating quality (especially of a student's performance) | Synonyms: grade, score |
| (noun) a written or printed symbol (as for punctuation) | - |
| (noun) a symbol of disgrace or infamy | Synonyms: brand, stain, stigma |
| (noun) a distinguishing symbol | Synonyms: marker, marking |
| (noun) a visible indication made on a surface | Synonyms: print |
| (noun) a reference point to shoot at | Synonyms: target |
| (noun) a perceptible indication of something not immediately apparent (as a visible clue that something has happened) | Synonyms: sign |
| (noun) a person who is gullible and easy to take advantage of | Synonyms: chump, fall guy, fool, gull, mug, patsy, soft touch, sucker |
| (noun) formerly the basic unit of money in Germany | Synonyms: Deutsche Mark, Deutschmark, German mark |
| meadowlark | (noun) North American songbirds having a yellow breast | Synonyms: lark |
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| mintmark | (noun) a mark on a coin that identifies the mint where it was produced | - |
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| nark | (noun) an informer or spy working for the police | Synonyms: copper's nark |
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| (noun) a lawman concerned with narcotics violations | Synonyms: narc, narcotics agent |
| park | (noun) a facility in which ball games are played (especially baseball games) | Synonyms: ballpark |
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| (noun) a gear position that acts as a parking brake | - |
| (noun) a large area of land preserved in its natural state as public property | Synonyms: parkland |
| (noun) a piece of open land for recreational use in an urban area | Synonyms: common, commons, green |
| (noun) a lot where cars are parked | Synonyms: car park, parking area, parking lot |
| pockmark | (noun) a scar or pit on the skin that is left by a pustule of smallpox or acne or other eruptive disease | - |
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| postmark | (noun) a cancellation mark stamped on mail by postal officials; indicates the post office and date of mailing | - |
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| pressmark | (noun) a mark consisting of characters written on a book; used to indicate shelf location | Synonyms: call mark, call number |
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| quark | (noun) fresh unripened cheese of a smooth texture made from pasteurized milk, a starter, and rennet | Synonyms: quark cheese |
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| (noun) (physics) hypothetical truly fundamental particle in mesons and baryons; there are supposed to be six flavors of quarks (and their antiquarks), which come in pairs; each has an electric charge of +2/3 or -1/3 | - |
| remark | (noun) explicit notice | - |
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| (noun) a statement that expresses a personal opinion or belief or adds information | Synonyms: comment, input |
| ropebark | (noun) deciduous shrub of eastern North America having tough flexible branches and pliable bark and small yellow flowers | Synonyms: Dirca palustris, leatherwood, moose-wood, moosewood, wicopy |
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| shagbark | (noun) North American hickory having loose grey shaggy bark and edible nuts | Synonyms: Carya ovata, shagbark hickory, shellbark, shellbark hickory |
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| shark | (noun) any of numerous elongate mostly marine carnivorous fishes with heterocercal caudal fins and tough skin covered with small toothlike scales | - |
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| (noun) a person who is unusually skilled in certain ways | - |
| (noun) a person who is ruthless and greedy and dishonest | - |
| shellbark | (noun) North American hickory having loose grey shaggy bark and edible nuts | Synonyms: Carya ovata, shagbark, shagbark hickory, shellbark hickory |
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| skylark | (noun) brown-speckled European lark noted for singing while hovering at a great height | Synonyms: Alauda arvensis |
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| smoothbark | (noun) any of several Australian eucalypts having the bark smooth except at or near the base of the trunk | - |
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| spark | (noun) merriment expressed by a brightness or gleam or animation of countenance | Synonyms: light, sparkle, twinkle |
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| (noun) a momentary flash of light | Synonyms: flicker, glint |
| (noun) a small fragment of a burning substance thrown out by burning material or by friction | - |
| (noun) electrical conduction through a gas in an applied electric field | Synonyms: arc, discharge, electric arc, electric discharge |
| (noun) a small but noticeable trace of some quality that might become stronger | - |
| squark | (noun) a quark with an electric charge of -1/3 and a mass 988 times that of an electron and a strangeness of -1 | Synonyms: strange quark |
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| stringybark | (noun) any of several Australian eucalypts having fibrous inner bark | - |
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| stylemark | (noun) a distinctive characteristic or attribute of someone or something | Synonyms: earmark, hallmark, trademark |
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| tanbark | (noun) bark rich in tannin; bruised and cut in pieces to use for tanning; spent tanbark used as a ground covering | - |
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| telemark | (noun) a turn made in skiing; the outside ski is placed ahead and turned gradually inwards | - |
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| tidemark | (noun) indicator consisting of a line at the highwater or low-water limits of the tides | - |
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| titlark | (noun) a songbird that lives mainly on the ground in open country; has streaky brown plumage | Synonyms: lark, pipit |
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| trademark | (noun) a distinctive characteristic or attribute of someone or something | Synonyms: earmark, hallmark, stylemark |
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| (noun) a formally registered symbol identifying the manufacturer or distributor of a product | - |
| watermark | (noun) a distinguishing mark impressed on paper during manufacture; visible when paper is held up to the light | - |
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| (noun) a line marking the level reached by a body of water | Synonyms: water line |