| 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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| crosshairs | (noun) a center of interest | - |
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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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| stairs | (noun) a flight of stairs or a flight of steps | Synonyms: steps |
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| upstairs | (noun) the part of a building above the ground floor | - |
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