^^^ So if 40 and Mac Dre are lyricists, what do you call artists such as Nas, Yuk, Rass Kass, Crooked-I, Jay-Z, Cormega, etc., ? Because 40 and Mac Dre are not in the same category.
"Clever with words" doesn't make you a lyricist. Punchlines, metaphores, multi-syllable rhyme-schemes, and subject matter; mix all these up, and you get a definition of a lyricist.