mushroom
noun
1.
2.
mushrooms and related fleshy fungi (including toadstools, puffballs, morels, coral fungi, etc.)
3.
any of various fleshy fungi of the subdivision Basidiomycota consisting of a cap at the end of a stem arising from an underground mycelium
4.
a large cloud of rubble and dust shaped like a mushroom and rising into the sky after an explosion (especially of a nuclear bomb)
5.