plant structure vs aril

plant structure and aril both are nouns.

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

As nouns, aril is a hyponym of plant structure; that is, aril is a word with a more specific, narrower meaning than plant structure:

plant structure: any part of a plant or fungus
aril: fleshy and usually brightly colored cover of some seeds that develops from the ovule stalk and partially or entirely envelops the seed

plant structure (noun)	aril (noun)
any part of a plant or fungus	fleshy and usually brightly colored cover of some seeds that develops from the ovule stalk and partially or entirely envelops the seed