| 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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| 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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| backstairs | (noun) a second staircase at the rear of a building | - |
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| bloodthirstiness | (noun) a disposition to shed blood | Synonyms: bloodiness |
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| crosshairs | (noun) a center of interest | - |
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| first | (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 |
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| (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 |
| firstborn | (noun) the offspring who came first in the order of birth | Synonyms: eldest |
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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 | (noun) making too fine distinctions of little importance | Synonyms: word-splitting |
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| 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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| 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 |
| thirster | (noun) a person with a strong desire for something | Synonyms: longer, yearner |
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| 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 |
| upstairs | (noun) the part of a building above the ground floor | - |
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