hunch vs hunch over

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

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

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

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

Other synonyms of hunch include hump, hunch forward.

hunch (noun)	hunch over (noun)
the act of bending yourself into a humped position
an impression that something might be the case

hunch (verb)	hunch over (verb)
round one's back by bending forward and drawing the shoulders forward	round one's back by bending forward and drawing the shoulders forward