grump vs misanthropist

grump and misanthropist both are nouns.

Word	Noun	Adjective	Verb	Adverb
grump	Yes	No	No	No
misanthropist	Yes	No	No	No

As nouns, misanthropist is a hyponym of grump; that is, misanthropist is a word with a more specific, narrower meaning than grump:

Other hyponyms of grump include crab, crabby person, fire-eater, hothead, misanthrope.

grump (noun)	misanthropist (noun)
a bad-tempered person	someone who dislikes people in general