chalaza vs plant structure

chalaza and plant structure both are nouns.

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

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

chalaza: basal part of a plant ovule opposite the micropyle; where integument and nucellus are joined
plant structure: any part of a plant or fungus

Other hypernyms of chalaza include plant part.

chalaza (noun)	plant structure (noun)
one of two spiral bands of tissue connecting the egg yolk to the enclosing membrane at either end of the shell	any part of a plant or fungus
basal part of a plant ovule opposite the micropyle; where integument and nucellus are joined