oyster agaric vs oyster fungus

oyster agaric and oyster fungus both are nouns.

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

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

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

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

oyster agaric (noun)	oyster fungus (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