Agaric and Death cap

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

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

Death cap noun - Extremely poisonous usually white fungus with a prominent cup-shaped base; differs from edible Agaricus only in its white gills.

Agaric and death cap are semantically related. Sometimes you can use "Agaric" instead a noun phrase "Death cap".