vapour vs clouding

vapour and clouding both are nouns.

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

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

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

vapour (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