vapour vs steam

vapour and steam both are nouns.

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

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

Other hyponyms of vapour include water vapor, water vapour.

vapour (noun)	steam (noun)
the process of becoming a vapor	water at boiling temperature diffused in the atmosphere
a visible suspension in the air of particles of some substance

vapour (verb)	steam (verb)
	cook something by letting steam pass over it
	clean by means of steaming
	get very agitated or angry
	rise as vapor
	travel by means of steam power
	emit steam