calyptra vs plant part

calyptra and plant part both are nouns.

Word	Noun	Adjective	Verb	Adverb
calyptra	Yes	No	No	No
plant part	Yes	No	No	No

As nouns, plant part is a hypernym of calyptra; that is, plant part is a word with a broader meaning than calyptra:

calyptra: the hood or cap covering the calyx of certain plants: e.g., the California poppy
plant part: any part of a plant or fungus

Other hypernyms of calyptra include plant structure.

calyptra (noun)	plant part (noun)
the hood or cap covering the calyx of certain plants: e.g., the California poppy	any part of a plant or fungus