steam vs emit

steam is a noun but emit is not a noun.

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

As verbs, emit is a hypernym of steam; that is, emit is a word with a broader meaning than steam:

steam: emit steam
emit: give off, send forth, or discharge; as of light, heat, or radiation, vapor, etc.

Other hypernyms of steam include give off, give out.

steam (noun)	emit (noun)
water at boiling temperature diffused in the atmosphere

steam (verb)	emit (verb)
cook something by letting steam pass over it	expel (gases or odors)
clean by means of steaming	express audibly; utter sounds (not necessarily words)
get very agitated or angry	give off, send forth, or discharge; as of light, heat, or radiation, vapor, etc.
rise as vapor
travel by means of steam power
emit steam