hypocycloid vs roulette

hypocycloid and roulette both are nouns.

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

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

hypocycloid: a line generated by a point on a circle that rolls around inside another circle
roulette: a line generated by a point on one figure rolling around a second figure

Other hypernyms of hypocycloid include line roulette.

hypocycloid (noun)	roulette (noun)
a line generated by a point on a circle that rolls around inside 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