stomach vs appetency

stomach and appetency both are nouns.

Word	Noun	Adjective	Verb	Adverb
stomach	Yes	No	Yes	No
appetency	Yes	No	No	No

As nouns, appetency is a hypernym of stomach; that is, appetency is a word with a broader meaning than stomach:

Other hypernyms of stomach include appetence, appetite.

stomach (noun)	appetency (noun)
an enlarged and muscular saclike organ of the alimentary canal; the principal organ of digestion	a feeling of craving something
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)	appetency (verb)
put up with something or somebody unpleasant
bear to eat