writer vs librettist

Other hyponyms of writer include abstracter, abstractor, alliterator, authoress, biographer, coauthor, joint author, commentator, reviewer, compiler, contributor, cyberpunk, drafter, dramatist, playwright, essayist, litterateur, folk writer, framer, gagman, gagster, gagwriter, ghost, ghostwriter, Gothic romancer, hack, hack writer, literary hack, journalist, lyricist, lyrist, novelist, pamphleteer, paragrapher, poet, polemic, polemicist, polemist, poetiser, poetizer, rhymer, rhymester, versifier, scenarist, scriptwriter, space writer, speechwriter, tragedian, wordmonger, word-painter, wordsmith.