tendril vs plant part

tendril and plant part both are nouns.

Word	Noun	Adjective	Verb	Adverb
tendril	Yes	No	No	No
plant part	Yes	No	No	No

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

tendril: slender stem-like structure by which some twining plants attach themselves to an object for support
plant part: any part of a plant or fungus

Other hypernyms of tendril include plant structure.

tendril (noun)	plant part (noun)
slender stem-like structure by which some twining plants attach themselves to an object for support	any part of a plant or fungus