mushroom -- (common name for an edible agaric (contrasting with the inedible toadstool))
mushroom -- (mushrooms and related fleshy fungi (including toadstools, puffballs, morels, coral fungi, etc.))
mushroom -- (any of various fleshy fungi of the subdivision Basidiomycota consisting of a cap at the end of a stem arising from an underground mycelium)
mushroom, mushroom cloud, mushroom-shaped cloud -- (a large cloud of rubble and dust shaped like a mushroom and rising into the sky after an explosion (especially of a nuclear bomb))
mushroom -- (fleshy body of any of numerous edible fungi)
Overview of verb mushroom
The verb mushroom has 2 senses
mushroom -- (pick or gather mushrooms; "We went mushrooming in the Fall")
mushroom -- (grow and spread fast; "The problem mushroomed")