smoke hole vs vent

smoke hole and vent both are nouns.

Word	Noun	Adjective	Verb	Adverb
smoke hole	Yes	No	No	No
vent	Yes	No	Yes	No

As nouns, vent is a hypernym of smoke hole; that is, vent is a word with a broader meaning than smoke hole:

Other hypernyms of smoke hole include blowhole, vent-hole, venthole.

smoke hole (noun)	vent (noun)
a vent (as in a roof) for smoke to escape	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

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