calyptra vs plant structure

calyptra and plant structure both are nouns.

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

As nouns, plant structure is a hypernym of calyptra; that is, plant structure 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 structure: any part of a plant or fungus

Other hypernyms of calyptra include plant part.

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