toothed wheel vs roulette

toothed wheel and roulette both are nouns.

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

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

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

toothed wheel (noun)	roulette (noun)
a wheel with teeth for making a row of perforations	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 line generated by a point on one figure rolling around a second figure