cloud vs mushroom cloud

cloud and mushroom cloud both are nouns.

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

As nouns, mushroom cloud is a hyponym of cloud; that is, mushroom cloud is a word with a more specific, narrower meaning than cloud:

cloud: any collection of particles (e.g., smoke or dust) or gases that is visible
mushroom 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 hyponyms of cloud include coma, nebula, aerosol, cosmic dust, dust cloud, mushroom-shaped cloud, mushroom.

cloud (noun)	mushroom cloud (noun)
a group of many things in the air or on the ground	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 visible mass of water or ice particles suspended at a considerable altitude
any collection of particles (e.g., smoke or dust) or gases that is visible
suspicion affecting your reputation
out of touch with reality
a cause of worry or gloom or trouble

cloud (verb)	mushroom cloud (verb)
colour with streaks or blotches of different shades
make milky or dull
make less clear
place under suspicion or cast doubt upon
make gloomy or depressed
billow up in the form of a cloud
make less visible or unclear
make overcast or cloudy