oyster agaric vs oyster mushroom

oyster agaric and oyster mushroom both are nouns.

Word	Noun	Adjective	Verb	Adverb
oyster agaric	Yes	No	No	No
oyster mushroom	Yes	No	No	No

As nouns, oyster agaric and oyster mushroom are synonyms defined as:

oyster agaric and oyster mushroom: edible agaric with a soft greyish cap growing in shelving masses on dead wood

Other synonyms of oyster agaric include oyster fungus, Pleurotus ostreatus.

oyster agaric (noun)	oyster mushroom (noun)
edible agaric with a soft greyish cap growing in shelving masses on dead wood	edible agaric with a soft greyish cap growing in shelving masses on dead wood