lobe vs plant part

lobe and plant part both are nouns.

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

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

Other hypernyms of lobe include plant structure.

lobe (noun)	plant part (noun)
a rounded projection that is part of a larger structure	any part of a plant or fungus
(anatomy) a somewhat rounded subdivision of a bodily organ or part
the enhanced response of an antenna in a given direction as indicated by a loop in its radiation pattern
(botany) a part into which a leaf is divided