Agaric and Oyster agaric

Agaric noun - A saprophytic fungus of the order Agaricales having an umbrellalike cap with gills on the underside.

Oyster agaric and agaric are semantically related. In some cases you can replace phrase "Oyster agaric" with "Agaric", this terms are similar.

Oyster agaric noun - Edible agaric with a soft greyish cap growing in shelving masses on dead wood.

Agaric and oyster agaric are semantically related. You can use "Agaric" instead a noun phrase "Oyster agaric".