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)
dichromacy: a deficiency of color vision in which the person can match any given hue by mixing only two other wavelengths of light (as opposed to the three wavelengths needed by people with normal color vision)