stomach vs belly button

stomach and belly button both are nouns.

Word	Noun	Adjective	Verb	Adverb
stomach	Yes	No	Yes	No
belly button	Yes	No	No	No

stomach (noun)	belly button (noun)
an enlarged and muscular saclike organ of the alimentary canal; the principal organ of digestion	a scar where the umbilical cord was attached
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

stomach (verb)	belly button (verb)
put up with something or somebody unpleasant
bear to eat