cloud vs water vapour

cloud and water vapour both are nouns.

Word	Noun	Adjective	Verb	Adverb
cloud	Yes	No	Yes	No
water vapour	Yes	No	No	No

cloud (noun)	water vapour (noun)
a group of many things in the air or on the ground	water in a vaporous form diffused in the atmosphere but below boiling temperature
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)	water vapour (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