third stomach vs breadbasket

third stomach and breadbasket both are nouns.

Word	Noun	Adjective	Verb	Adverb
third stomach	Yes	No	No	No
breadbasket	Yes	No	No	No

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

third stomach: the third compartment of the stomach of a ruminant
breadbasket: an enlarged and muscular saclike organ of the alimentary canal; the principal organ of digestion

Other hypernyms of third stomach include stomach, tum, tummy.

third stomach (noun)	breadbasket (noun)
the third compartment of the stomach of a ruminant	a basket for serving bread
	an enlarged and muscular saclike organ of the alimentary canal; the principal organ of digestion
	a geographic region serving as the principal source of grain