Vent

a hole for the escape of gas or air

external opening of urinary or genital system of a lower vertebrate

a fissure in the earth's crust (or in the surface of some other planet) through which molten lava and gases erupt

a slit in a garment (as in the back seam of a jacket)

activity that frees or expresses creative energy or emotion

give expression or utterance to

expose to cool or cold air so as to cool or freshen