cog vs sprocket

cog and sprocket both are nouns.

Word	Noun	Adjective	Verb	Adverb
cog	Yes	No	Yes	No
sprocket	Yes	No	No	No

As nouns, cog and sprocket are synonyms defined as:

cog (noun)	sprocket (noun)
tooth on the rim of gear wheel	thin wheel with teeth that engage with a chain
a subordinate who performs an important but routine function	tooth on the rim of gear wheel
	roller that has teeth on the rims to pull film or paper through

cog (verb)	sprocket (verb)
join pieces of wood with cogs
roll steel ingots