vapor vs steam

vapor and steam both are nouns.

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

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

Other hyponyms of vapor include water vapor, water vapour.

vapor (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

vapor (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