Definition of word :
1. A brief remark or observation; an expression; a phrase, clause, or short sentence.
2. Account; tidings; message; communication; information; - used only in the singular.
3. Hence, the written or printed character, or combination of characters, expressing such a term; as, the words on a page.
4. Language considered as implying the faith or authority of the person who utters it; statement; affirmation; declaration; promise.
5. Signal; order; command; direction.
6. Talk; discourse; speech; language.
7. The spoken sign of a conception or an idea; an articulate or vocal sound, or a combination of articulate and vocal sounds, uttered by the human voice, and by custom expressing an idea or ideas; a single component part of human speech or language; a constituent part of a sentence; a term; a vocable.
8. To express in words; to phrase.
9. To flatter with words; to cajole.
10. To ply with words; also, to cause to be by the use of a word or words.
11. To use words, as in discussion; to argue; to dispute.
12. Verbal contention; dispute.
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guarantee (part of speech: noun)
word (part of speech: noun)
promise (part of speech: verb)