| accountant | (noun) someone who maintains and audits business accounts | Synonyms: comptroller, controller |
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| adjutant | (noun) large Indian stork with a military gait | Synonyms: adjutant bird, adjutant stork, Leptoptilus dubius |
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| (noun) an officer who acts as military assistant to a more senior officer | Synonyms: aide-de-camp, aide |
| annuitant | (noun) the recipient of an annuity | - |
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| assistant | (noun) a person who contributes to the fulfillment of a need or furtherance of an effort or purpose | Synonyms: help, helper, supporter |
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| attestant | (noun) (law) a person who attests to the genuineness of a document or signature by adding their own signature | Synonyms: attestator, attestor, witness |
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| (noun) someone who affirms or vouches for the correctness or truth or genuineness of something | Synonyms: attester |
| chemoattractant | (noun) a substance inducing positive chemotaxis in motile cells. | - |
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| combatant | (noun) someone who fights (or is fighting) | Synonyms: battler, belligerent, fighter, scrapper |
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| concomitant | (noun) an event or situation that happens at the same time as or in connection with another | Synonyms: accompaniment, attendant, co-occurrence |
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| constant | (noun) a quantity that does not vary | Synonyms: constant quantity, invariable |
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| (noun) a number representing a quantity assumed to have a fixed value in a specified mathematical context | - |
| consultant | (noun) an expert who gives advice | Synonyms: adviser, advisor |
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| contestant | (noun) a person who participates in competitions | - |
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| (noun) a person who dissents from some established policy | Synonyms: dissenter, dissident, objector, protester |
| counterirritant | (noun) a medicine applied locally to produce superficial inflammation in order to reduce deeper inflammation | - |
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| decongestant | (noun) a drug that decreases pulmonary congestion | - |
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| dilutant | (noun) a diluting agent | Synonyms: diluent, thinner |
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| disinfectant | (noun) an agent (as heat or radiation or a chemical) that destroys microorganisms that might carry disease | Synonyms: antimicrobial, antimicrobic, germicide |
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| disputant | (noun) a person who disputes; who is good at or enjoys controversy | Synonyms: controversialist, eristic |
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| excitant | (noun) a drug that temporarily quickens some vital process | Synonyms: stimulant, stimulant drug |
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| executant | (noun) a performer (usually of musical works) | - |
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| extractant | (noun) an immiscible liquid used to extract a substance from another liquid. | - |
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| habitant | (noun) a person who inhabits a particular place | Synonyms: denizen, dweller, indweller, inhabitant |
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| humectant | (noun) any substance that is added to another substance to keep it moist | - |
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| inhabitant | (noun) a person who inhabits a particular place | Synonyms: denizen, dweller, habitant, indweller |
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| injectant | (noun) any solution that is injected (as into the skin) | Synonyms: injection |
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| instant | (noun) a particular point in time | Synonyms: minute, moment, second |
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| (noun) a very short time (as the time it takes the eye to blink or the heart to beat) | Synonyms: blink of an eye, flash, heartbeat, jiffy, New York minute, split second, trice, twinkling, wink |
| irritant | (noun) something that causes irritation and annoyance | Synonyms: thorn |
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| militant | (noun) a militant reformer | Synonyms: activist |
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| mutant | (noun) an animal that has undergone mutation | - |
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| (noun) (biology) an organism that has characteristics resulting from chromosomal alteration | Synonyms: mutation, sport, variation |
| noncombatant | (noun) a member of the armed forces who does not participate in combat (e.g. a chaplain or surgeon) | - |
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| octant | (noun) a measuring instrument for measuring angles to a celestial body; similar to a sextant but with 45 degree calibration | - |
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| oxtant | (noun) a unit of angular distance equal to half a quadrant | - |
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| pollutant | (noun) waste matter that contaminates the water or air or soil | - |
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| precipitant | (noun) an agent that causes a precipitate to form | - |
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| reactant | (noun) a chemical substance that is present at the start of a chemical reaction | - |
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| reductant | (noun) a substance capable of bringing about the reduction of another substance as it itself is oxidized; used in photography to lessen the density of a negative or print by oxidizing some of the loose silver | Synonyms: reducer, reducing agent |
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| resultant | (noun) a vector that is the sum of two or more other vectors | Synonyms: vector sum |
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| (noun) something that results | Synonyms: final result, outcome, result, termination |
| (noun) the final point in a process | Synonyms: end point |
| retreatant | (noun) a participant in a religious retreat | - |
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| sextant | (noun) a measuring instrument for measuring the angular distance between celestial objects; resembles an octant | - |
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| (noun) a unit of angular distance equal to 60 degrees | - |
| supernatant | (noun) the clear liquid that lies above a sediment or precipitate | - |
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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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| visitant | (noun) someone who visits | Synonyms: visitor |
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