abomasum vs tummy

abomasum and tummy both are nouns.

Word	Noun	Adjective	Verb	Adverb
abomasum	Yes	No	No	No
tummy	Yes	No	No	No

As nouns, tummy is a hypernym of abomasum; that is, tummy is a word with a broader meaning than abomasum:

abomasum: the fourth compartment of the stomach of a ruminant; the one where digestion takes place
tummy: an enlarged and muscular saclike organ of the alimentary canal; the principal organ of digestion

Other hypernyms of abomasum include breadbasket, stomach, tum.

abomasum (noun)	tummy (noun)
the fourth compartment of the stomach of a ruminant; the one where digestion takes place	an enlarged and muscular saclike organ of the alimentary canal; the principal organ of digestion
	slang for a paunch