death cap: extremely poisonous usually white fungus with a prominent cup-shaped base; differs from edible Agaricus only in its white gills
entity: that which is perceived or known or inferred to have its own distinct existence (living or nonliving)
mule's ears: balsamic-resinous herb with clumps of lanceolate leaves and stout leafy stems ending in large deep yellow flowers on long stalks; northwestern United States