lamella vs plant organ

lamella and plant organ both are nouns.

Word	Noun	Adjective	Verb	Adverb
lamella	Yes	No	No	No
plant organ	Yes	No	No	No

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

lamella: any of the radiating leaflike spore-producing structures on the underside of the cap of a mushroom or similar fungus
plant organ: a functional and structural unit of a plant or fungus

lamella (noun)	plant organ (noun)
thin plate	a functional and structural unit of a plant or fungus
a thin membrane that is one of the calcified layers that form bones
any of the radiating leaflike spore-producing structures on the underside of the cap of a mushroom or similar fungus