pileus vs plant part

pileus and plant part both are nouns.

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

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

pileus: a fruiting structure resembling an umbrella or a cone that forms the top of a stalked fleshy fungus such as a mushroom
plant part: any part of a plant or fungus

Other hypernyms of pileus include plant structure.

pileus (noun)	plant part (noun)
a fruiting structure resembling an umbrella or a cone that forms the top of a stalked fleshy fungus such as a mushroom	any part of a plant or fungus