In grammar, any word that is derived from some other word, e.g., a verb that is derived from a noun (e.g., 'to skin,' 'to fish,' 'to winter'), a noun from another noun (e.g., 'kingdom' from 'king'), a noun from a verb ('killer' from 'kill'). Words that are not derived from some other words are said to be primitive (e.g., 'father,' 'mother').
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