pit of the stomach vs stomach

pit of the stomach and stomach both are nouns.

Word	Noun	Adjective	Verb	Adverb
pit of the stomach	Yes	No	No	No
stomach	Yes	No	Yes	No

pit of the stomach (noun)	stomach (noun)
a slight depression in the midline just below the sternum (where a blow can affect the solar plexus)	an enlarged and muscular saclike organ of the alimentary canal; the principal organ of digestion
	the region of the body of a vertebrate between the thorax and the pelvis
	an appetite for food
	an inclination or liking for things involving conflict or difficulty or unpleasantness

pit of the stomach (verb)	stomach (verb)
	put up with something or somebody unpleasant
	bear to eat