vapor vs clouding

vapor and clouding both are nouns.

Word	Noun	Adjective	Verb	Adverb
vapor	Yes	No	No	No
clouding	Yes	No	No	No

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

Other hyponyms of vapor include boiling, clouding up, smoke, smoking.

vapor (noun)	clouding (noun)
the process of becoming a vapor	the process whereby water particles become visible in the sky
a visible suspension in the air of particles of some substance