Expand is a related term of mushroom.
As verbs the difference between expand and mushroom
is that expand
) to change (something) from a smaller form and/or size to a larger one while mushroom
is to grow quickly to a large size.
As a noun mushroom is
any of the fleshy fruiting bodies]] of [[fungus|fungi typically produced above ground on soil or on their food sources (such as decaying wood).
As an adjective mushroom is
having characteristics like those of a mushroom, for example in shape or appearance, speed of growth, or texture.