hump vs hunch over

hump is a noun but hunch over is not a noun.

Word	Noun	Adjective	Verb	Adverb
hump	Yes	No	Yes	No
hunch over	No	No	Yes	No

As verbs, hump and hunch over are synonyms defined as:

hump and hunch over: round one's back by bending forward and drawing the shoulders forward

Other synonyms of hump include hunch, hunch forward.

hump (noun)	hunch over (noun)
something that bulges out or is protuberant or projects from its surroundings

hump (verb)	hunch over (verb)
have sexual intercourse with	round one's back by bending forward and drawing the shoulders forward
round one's back by bending forward and drawing the shoulders forward