vent vs vent-hole

vent and vent-hole both are nouns.

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

As nouns, vent and vent-hole are synonyms defined as:

Other synonyms of vent include blowhole, venthole.

vent (noun)	vent-hole (noun)
activity that frees or expresses creative energy or emotion	a hole for the escape of gas or air
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

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