roulette vs toothed wheel

roulette and toothed wheel both are nouns.

Word	Noun	Adjective	Verb	Adverb
roulette	Yes	No	No	No
toothed wheel	Yes	No	No	No

As nouns, roulette and toothed wheel are synonyms defined as:

roulette and toothed wheel: a wheel with teeth for making a row of perforations

roulette (noun)	toothed wheel (noun)
a gambling game in which players bet on which compartment of a revolving wheel a small ball will come to rest in	a wheel with teeth for making a row of perforations
a wheel with teeth for making a row of perforations
a line generated by a point on one figure rolling around a second figure