Agaric and Fly agaric

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

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

Fly agaric noun - Poisonous (but rarely fatal) woodland fungus having a scarlet cap with white warts and white gills.

Agaric and fly agaric are semantically related. You can use "Agaric" instead a noun phrase "Fly agaric".