Answer:

sprocket

Answer	Crossword Clue
SPROCKET	Cog
SPROCKET	Machine wheel
SPROCKET	Pulley with teeth

SPROCKET	Tooth of a wheel.
SPROCKET	Motion-picture machine part.
SPROCKET	Bicycle part.
SPROCKET	Toothed metal wheel.
SPROCKET	Toad the Wet ...
SPROCKET	Bicycle part

Crossword

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