stipule vs plant structure

stipule and plant structure both are nouns.

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

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

stipule: a small leafy outgrowth at the base of a leaf or its stalk; usually occurring in pairs and soon shed
plant structure: any part of a plant or fungus

Other hypernyms of stipule include plant part.

stipule (noun)	plant structure (noun)
a small leafy outgrowth at the base of a leaf or its stalk; usually occurring in pairs and soon shed	any part of a plant or fungus