Answer:

spiracle

Answer	Crossword Clue
SPIRACLE	Whale's blowhole.
SPIRACLE	Air hole
SPIRACLE	Insect's opening for air

SPIRACLE	Whale's blowhole
SPIRACLE	Whale's blowhole, e.g.

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.