rye vs caryopsis

rye and caryopsis both are nouns.

Word	Noun	Adjective	Verb	Adverb
rye	Yes	No	No	No
caryopsis	Yes	No	No	No

As nouns, caryopsis is a hypernym of rye; that is, caryopsis is a word with a broader meaning than rye:

rye: the seed of the cereal grass
caryopsis: dry seed-like fruit produced by the cereal grasses: e.g. wheat, barley, Indian corn

Other hypernyms of rye include grain.

rye (noun)	caryopsis (noun)
whiskey distilled from rye or rye and malt	dry seed-like fruit produced by the cereal grasses: e.g. wheat, barley, Indian corn
hardy annual cereal grass widely cultivated in northern Europe where its grain is the chief ingredient of black bread and in North America for forage and soil improvement
the seed of the cereal grass