- blowhole - the spiracle of a cetacean located far back on the skull
--1 is a kind of spiracle
--1 is a part of cetacean, cetacean mammal, blower- vent, venthole, vent-hole, blowhole - a hole for the escape of gas or air
--2 is a kind of hole
--2 is a part of air passage, air duct, airway
--2 has particulars: smoke hole - vent, venthole, vent-hole, blowhole - a hole for the escape of gas or air