region vs breadbasket

region and breadbasket both are nouns.

Word	Noun	Adjective	Verb	Adverb
region	Yes	No	No	No
breadbasket	Yes	No	No	No

As nouns, breadbasket is a hyponym of region; that is, breadbasket is a word with a more specific, narrower meaning than region:

region (noun)	breadbasket (noun)
a part of an animal that has a special function or is supplied by a given artery or nerve	a basket for serving bread
a knowledge domain that you are interested in or are communicating about	an enlarged and muscular saclike organ of the alimentary canal; the principal organ of digestion
the extended spatial location of something	a geographic region serving as the principal source of grain
a large indefinite location on the surface of the Earth
the approximate amount of something (usually used prepositionally as in `in the region of')