galea vs plant organ

galea and plant organ both are nouns.

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

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

galea: an organ shaped like a helmet; usually a vaulted and enlarged petal as in Aconitum
plant organ: a functional and structural unit of a plant or fungus

galea (noun)	plant organ (noun)
an organ shaped like a helmet; usually a vaulted and enlarged petal as in Aconitum	a functional and structural unit of a plant or fungus