mushroom means: One of the many types of wild or cultivated fleshy mushrooms. It usually consists of a stem and a cap that may contain gills or mycelium. (in Cooking Dictionary)

What else does mushroom mean?

One of many fungi which produce fleshy fruiting bodies, particularly one with an umbrella-shaped stalk. (in Merlin Dictionary)

All of these fungi are edible except the most widely cultivated. Agaricus bisporus. (in Merlin Dictionary)

This is the usually overground fruiting body for any one of these fungi. (in Merlin Dictionary)

These fruiting bodies produce hallucinations upon ingestion. (in Merlin Dictionary)

These fungi can be molded into something. (in Merlin Dictionary)

To rapidly multiply, grow or expand. (in Merlin Dictionary)

The ability to expand or swell into an appearance similar to that of a mushroom. (in Merlin Dictionary)

Wild mushrooms can be collected (in Merlin Dictionary)

Referring to mushrooms, including those that are either consisting of or contain them. (in Merlin Dictionary)

It resembles mushrooms, in terms of its rapid growth rate or evanescence. (in Merlin Dictionary)