vent-hole vs vent

vent-hole and vent both are nouns.

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

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

Other synonyms of vent-hole include blowhole, venthole.

vent-hole (noun)	vent (noun)
a hole for the escape of gas or air	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

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