craw vs tummy

craw and tummy both are nouns.

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

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

craw: a pouch in many birds and some lower animals that resembles a stomach for storage and preliminary maceration of food
tummy: an enlarged and muscular saclike organ of the alimentary canal; the principal organ of digestion

Other hypernyms of craw include breadbasket, stomach, tum.

craw (noun)	tummy (noun)
a pouch in many birds and some lower animals that resembles a stomach for storage and preliminary maceration of food	an enlarged and muscular saclike organ of the alimentary canal; the principal organ of digestion
	slang for a paunch