epicycloid vs roulette

epicycloid and roulette both are nouns.

Word	Noun	Adjective	Verb	Adverb
epicycloid	Yes	No	No	No
roulette	Yes	No	No	No

As nouns, roulette is a hypernym of epicycloid; that is, roulette is a word with a broader meaning than epicycloid:

epicycloid: a line generated by a point on a circle rolling around another circle
roulette: a line generated by a point on one figure rolling around a second figure

Other hypernyms of epicycloid include line roulette.

epicycloid (noun)	roulette (noun)
a line generated by a point on a circle rolling around another circle	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