cloud vs cosmic dust

cloud and cosmic dust both are nouns.

Word	Noun	Adjective	Verb	Adverb
cloud	Yes	No	Yes	No
cosmic dust	Yes	No	No	No

As nouns, cosmic dust is a hyponym of cloud; that is, cosmic dust 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
cosmic dust: clouds of particles or gases occurring throughout interstellar space

Other hyponyms of cloud include coma, nebula, aerosol, dust cloud, mushroom-shaped cloud, mushroom, mushroom cloud.

cloud (noun)	cosmic dust (noun)
a group of many things in the air or on the ground	clouds of particles or gases occurring throughout interstellar space
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)	cosmic dust (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