cog vs cogwheel

cog and cogwheel both are nouns.

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

cog (noun)	cogwheel (noun)
tooth on the rim of gear wheel	a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion
a subordinate who performs an important but routine function

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