underbody vs venter

underbody and venter both are nouns.

Word	Noun	Adjective	Verb	Adverb
underbody	Yes	No	No	No
venter	Yes	No	No	No

As nouns, venter is a hypernym of underbody; that is, venter is a word with a broader meaning than underbody:

underbody: the soft belly or underside of an animal's body
venter: the region of the body of a vertebrate between the thorax and the pelvis

Other hypernyms of underbody include abdomen, belly, stomach.

underbody (noun)	venter (noun)
the soft belly or underside of an animal's body	the region of the body of a vertebrate between the thorax and the pelvis
	a bulging body part (as the belly of a muscle)
	the womb
	a speaker who expresses or gives vent to a personal opinion or grievance