air duct vs vent

air duct and vent both are nouns.

Word	Noun	Adjective	Verb	Adverb
air duct	Yes	No	No	No
vent	Yes	No	Yes	No

air duct (noun)	vent (noun)
a duct that provides ventilation (as in mines)	activity that frees or expresses creative energy or emotion
	external opening of urinary or genital system of a lower vertebrate
	a hole for the escape of gas or air
	a slit in a garment (as in the back seam of a jacket)
	a fissure in the earth's crust (or in the surface of some other planet) through which molten lava and gases erupt

air duct (verb)	vent (verb)
	expose to cool or cold air so as to cool or freshen
	give expression or utterance to