cataphyll vs cotyledon

cataphyll and cotyledon both are nouns.

Word	Noun	Adjective	Verb	Adverb
cataphyll	Yes	No	No	No
cotyledon	Yes	No	No	No

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

cataphyll: a reduced or scarcely developed leaf at the start of a plant's life (i.e., cotyledons) or in the early stages of leaf development
cotyledon: embryonic leaf in seed-bearing plants

Other hyponyms of cataphyll include seed leaf.

cataphyll (noun)	cotyledon (noun)
a reduced or scarcely developed leaf at the start of a plant's life (i.e., cotyledons) or in the early stages of leaf development	embryonic leaf in seed-bearing plants