mushroom cloud vs mushroom-shaped cloud

mushroom cloud and mushroom-shaped cloud both are nouns.

Word	Noun	Adjective	Verb	Adverb
mushroom cloud	Yes	No	No	No
mushroom-shaped cloud	Yes	No	No	No

As nouns, mushroom cloud and mushroom-shaped cloud are synonyms defined as:

mushroom cloud and 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)

Other synonyms of mushroom cloud include mushroom.

mushroom cloud (noun)	mushroom-shaped cloud (noun)
a large cloud of rubble and dust shaped like a mushroom and rising into the sky after an explosion (especially of a nuclear bomb)	a large cloud of rubble and dust shaped like a mushroom and rising into the sky after an explosion (especially of a nuclear bomb)