abdomen vs venter

abdomen and venter both are nouns.

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

As nouns, abdomen and venter are synonyms defined as:

abdomen and venter: the region of the body of a vertebrate between the thorax and the pelvis

Other synonyms of abdomen include belly, stomach.

abdomen (noun)	venter (noun)
the region of the body of a vertebrate between the thorax and the pelvis	the region of the body of a vertebrate between the thorax and the pelvis
the cavity containing the major viscera; in mammals it is separated from the thorax by the diaphragm	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