Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun blowhole

2 senses of blowhole

Sense 1
blowhole -- (the spiracle of a cetacean located far back on the skull)
       => spiracle -- (a breathing orifice)

Sense 2
vent, venthole, vent-hole, blowhole -- (a hole for the escape of gas or air)
       => hole -- (an opening deliberately made in or through something)