lip vs plant part

lip and plant part both are nouns.

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

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

Other hypernyms of lip include plant structure.

lip (noun)	plant part (noun)
either the outer margin or the inner margin of the aperture of a gastropod's shell	any part of a plant or fungus
the top edge of a vessel or other container
either of two fleshy folds of tissue that surround the mouth and play a role in speaking
an impudent or insolent rejoinder
(botany) either of the two parts of a bilabiate corolla or calyx