sawdust mushroom vs Pluteus

sawdust mushroom and Pluteus both are nouns.

Word	Noun	Adjective	Verb	Adverb
sawdust mushroom	Yes	No	No	No
Pluteus	Yes	No	No	No

sawdust mushroom (noun)	Pluteus (noun)
an edible agaric found in piles of hardwood sawdust; the caps are black and coarsely wrinkled	a large genus of fungi belonging to the family Pluteaceae; the shape of the cap resembles a roof; often abundant early in the summer