| affairs | (noun) transactions of professional or public interest | - |
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| (noun) matters of personal concern | Synonyms: personal business, personal matters |
| airs | (noun) affected manners intended to impress others | Synonyms: pose |
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| airscrew | (noun) a propeller that rotates to push against air | Synonyms: airplane propeller, prop |
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| airship | (noun) a steerable self-propelled aircraft | Synonyms: dirigible |
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| airsick | (adjective) experiencing motion sickness | Synonyms: air sick, carsick, seasick |
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| airsickness | (noun) motion sickness experienced while traveling by air (especially during turbulence) | Synonyms: air sickness |
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| airspace | (noun) the atmosphere above a nation that is deemed to be under its jurisdiction | - |
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| (noun) the space in the atmosphere immediately above the earth | Synonyms: air space |
| airspeed | (noun) the speed of an aircraft relative to the air in which it is flying | - |
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| airstream | (noun) a relatively well-defined prevailing wind | - |
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| (noun) the flow of air that is driven backwards by an aircraft propeller | Synonyms: backwash, race, slipstream, wash |
| airstrip | (noun) an airfield without normal airport facilities | Synonyms: flight strip, landing strip, strip |
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| athirst | (adjective) (usually followed by `for') extremely desirous | Synonyms: hungry, thirsty |
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| backstairs | (adjective) secret and sly or sordid | Synonyms: backstair, furtive |
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| (noun) a second staircase at the rear of a building | - |
| bloodthirstiness | (noun) a disposition to shed blood | Synonyms: bloodiness |
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| bloodthirsty | (adjective) marked by eagerness to resort to violence and bloodshed | Synonyms: bloody-minded, sanguinary |
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| crosshairs | (noun) a center of interest | - |
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| downstairs | (adjective) on or of lower floors of a building | Synonyms: downstair |
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| (adverb) on a floor below | Synonyms: below, down the stairs, on a lower floor |
| feetfirst | (adverb) with the feet foremost | - |
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| first | (adjective) preceding all others in time or space or degree | Synonyms: 1st |
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| (adjective) highest in pitch or chief among parts or voices or instruments or orchestra sections | - |
| (adjective) ranking above all others | Synonyms: foremost, world-class |
| (adjective) serving to begin | Synonyms: beginning |
| (adjective) serving to set in motion | Synonyms: inaugural, initiative, initiatory, maiden |
| (noun) the fielding position of the player on a baseball team who is stationed at first of the bases in the infield (counting counterclockwise from home plate) | Synonyms: first base |
| (noun) the lowest forward gear ratio in the gear box of a motor vehicle; used to start a car moving | Synonyms: first gear, low, low gear |
| (noun) an honours degree of the highest class | Synonyms: first-class honours degree |
| (noun) the first element in a countable series | Synonyms: number 1, number one |
| (noun) the first or highest in an ordering or series | Synonyms: number one |
| (noun) the time at which something is supposed to begin | Synonyms: beginning, commencement, get-go, kickoff, offset, outset, showtime, start, starting time |
| (adverb) before anything else | Synonyms: first of all, first off, firstly, foremost |
| (adverb) prominently forward | Synonyms: foremost |
| (adverb) the initial time | - |
| (adverb) before another in time, space, or importance | - |
| firstborn | (adjective) first in order of birth | Synonyms: eldest |
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| (noun) the offspring who came first in the order of birth | Synonyms: eldest |
| firsthand | (adjective) received directly from a source | - |
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| (adverb) from the original source; directly | Synonyms: at first hand |
| firstly | (adverb) before anything else | Synonyms: first, first of all, first off, foremost |
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| hairsbreadth | (noun) a very small distance or space | Synonyms: hair's-breadth, hair, whisker |
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| hairsplitter | (noun) a disputant who makes unreasonably fine distinctions | - |
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| hairsplitting | (adjective) developed in excessively fine detail | Synonyms: finespun |
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| (noun) making too fine distinctions of little importance | Synonyms: word-splitting |
| hairspring | (noun) a fine spiral spring that regulates the movement of the balance wheel in a timepiece | - |
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| hairstreak | (noun) small butterflies having striped markings under the wings | Synonyms: hairstreak butterfly |
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| hairstyle | (noun) the arrangement of the hair (especially a woman's hair) | Synonyms: coif, coiffure, hair style, hairdo |
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| hairstylist | (noun) someone who cuts or beautifies hair | Synonyms: hairdresser, styler, stylist |
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| headfirst | (adjective) with the head foremost | Synonyms: headlong |
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| (adverb) with the head before the body | Synonyms: headlong |
| hirsute | (adjective) having or covered with hair | Synonyms: haired, hairy |
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| hirsuteness | (noun) excessive hairiness | Synonyms: hirsutism |
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| hirsutism | (noun) excessive hairiness | Synonyms: hirsuteness |
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| kirsch | (noun) from fermented juice of black morello cherries | - |
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| stairs | (noun) a flight of stairs or a flight of steps | Synonyms: steps |
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| thirst | (noun) strong desire for something (not food or drink) | Synonyms: hunger, hungriness, thirstiness |
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| (noun) a physiological need to drink | Synonyms: thirstiness |
| (verb) have a craving, appetite, or great desire for | Synonyms: crave, hunger, lust, starve |
| (verb) feel the need to drink | - |
| thirster | (noun) a person with a strong desire for something | Synonyms: longer, yearner |
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| thirstily | (adverb) in a thirsty manner | - |
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| (adverb) with eagerness; in an eager manner | Synonyms: eagerly |
| thirstiness | (noun) strong desire for something (not food or drink) | Synonyms: hunger, hungriness, thirst |
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| (noun) a physiological need to drink | Synonyms: thirst |
| (noun) a deficiency of moisture (especially when resulting from a permanent absence of rainfall) | Synonyms: aridity, aridness |
| thirsty | (adjective) feeling a need or desire to drink | - |
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| (adjective) able to take in large quantities of moisture | - |
| (adjective) (usually followed by `for') extremely desirous | Synonyms: athirst, hungry |
| (adjective) needing moisture | - |
| upstairs | (adjective) on or of upper floors of a building | Synonyms: upstair |
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| (noun) the part of a building above the ground floor | - |
| (adverb) on a floor above | Synonyms: on a higher floor, up the stairs |
| (adverb) with respect to the mind | - |