| athirst | (adjective) (usually followed by `for') extremely desirous | Synonyms: hungry, thirsty |
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| 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 | - |
| headfirst | (adjective) with the head foremost | Synonyms: headlong |
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| (adverb) with the head before the body | Synonyms: headlong |
| 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 | - |