| acerbity | (noun) a rough and bitter manner | Synonyms: acrimony, bitterness, jaundice, tartness, thorniness |
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| (noun) a sharp sour taste | Synonyms: tartness |
| (noun) a sharp bitterness | - |
| acerola | (noun) acid red or yellow cherry-like fruit of a tropical American shrub very rich in vitamin C | Synonyms: barbados cherry, surinam cherry, West Indian cherry |
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| (noun) tropical American shrub bearing edible acid red fruit resembling cherries | Synonyms: barbados cherry, Malpighia glabra, Surinam cherry, West Indian cherry |
| acervulus | (noun) small asexual fruiting body resembling a cushion or blister consisting of a mat of hyphae that is produced on a host by some fungi | - |
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| backspacer | (noun) the typewriter key used for back spacing | Synonyms: backspace, backspace key |
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| bracer | (noun) a tonic or restorative (especially a drink of liquor) | Synonyms: pick-me-up |
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| (noun) a protective covering for the wrist or arm that is used in archery and fencing and other sports | Synonyms: armguard |
| bracero | (noun) a Mexican laborer who worked in the United States on farms and railroads in order to ease labor shortages during World War II | - |
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| exacerbation | (noun) violent and bitter exasperation | - |
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| (noun) action that makes a problem or a disease (or its symptoms) worse | Synonyms: aggravation |
| facer | (noun) (a dated Briticism) a serious difficulty with which one is suddenly faced | - |
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| lacer | (noun) a workman who laces shoes or footballs or books (during binding) | - |
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| laceration | (noun) the act of lacerating | - |
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| (noun) a torn ragged wound | - |
| lacertid | (noun) Old World terrestrial lizard | Synonyms: lacertid lizard |
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| macer | (noun) an official who carries a mace of office | Synonyms: mace, macebearer |
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| macerate | (noun) a macerated substance, sometimes used to infuse vodka with flavor. | - |
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| maceration | (noun) extreme leanness (usually caused by starvation or disease) | Synonyms: boniness, bonyness, emaciation, gauntness |
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| (noun) softening due to soaking or steeping | - |
| pacer | (noun) a horse trained to a special gait in which both feet on one side leave the ground together | - |
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| (noun) a horse used to set the pace in racing | Synonyms: pacemaker, pacesetter |
| placer | (noun) an alluvial deposit that contains particles of some valuable mineral | - |
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| racer | (noun) an animal that races | - |
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| (noun) slender fast-moving North American snakes | - |
| (noun) a fast car that competes in races | Synonyms: race car, racing car |
| (noun) someone who drives racing cars at high speeds | Synonyms: automobile driver, race driver |
| racerunner | (noun) very swift lizard of eastern and central United States | Synonyms: Cnemidophorus sexlineatus, race runner, six-lined racerunner |
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| sacerdotalism | (noun) a belief that priests can act as mediators between human beings and God | - |
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| tracer | (noun) ammunition whose flight can be observed by a trail of smoke | Synonyms: tracer bullet |
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| (noun) (radiology) any radioactive isotope introduced into the body to study metabolism or other biological processes | - |
| (noun) an instrument used to make tracings | - |
| (noun) an investigator who is employed to find missing persons or missing goods | - |
| tracery | (noun) decoration consisting of an open pattern of interlacing ribs | - |
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