vaporousness vs vapourousness

vaporousness and vapourousness both are nouns.

Word	Noun	Adjective	Verb	Adverb
vaporousness	Yes	No	No	No
vapourousness	Yes	No	No	No

As nouns, vaporousness and vapourousness are synonyms defined as:

vaporousness and vapourousness: cloudiness resulting from haze or mist or vapor

Other synonyms of vaporousness include haziness, mistiness, steaminess.

vaporousness (noun)	vapourousness (noun)
cloudiness resulting from haze or mist or vapor	cloudiness resulting from haze or mist or vapor