- sprocket - roller that has teeth on the rims to pull film or paper through
--1 is a kind of roller
--1 is a part of camera, photographic camera- sprocket, sprocket wheel - thin wheel with teeth that engage with a chain
--2 is a kind of wheel
--2 is a part of bicycle, bike, wheel, cycle- cog, sprocket - tooth on the rim of gear wheel
--3 is a kind of tooth
--3 is a part of gear, gear wheel, cogwheel - sprocket, sprocket wheel - thin wheel with teeth that engage with a chain