hunch vs hunch forward

hunch is a noun but hunch forward is not a noun.

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

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

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

Other synonyms of hunch include hump, hunch over.

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

hunch (verb)	hunch forward (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