lobe vs plant structure

lobe and plant structure both are nouns.

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

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

Other hypernyms of lobe include plant part.

lobe (noun)	plant structure (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