tree stump vs plant structure

tree stump and plant structure both are nouns.

Word	Noun	Adjective	Verb	Adverb
tree stump	Yes	No	No	No
plant structure	Yes	No	No	No

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

tree stump: the base part of a tree that remains standing after the tree has been felled
plant structure: any part of a plant or fungus

Other hypernyms of tree stump include plant part.

tree stump (noun)	plant structure (noun)
the base part of a tree that remains standing after the tree has been felled	any part of a plant or fungus