hypocycloid vs line roulette

hypocycloid and line roulette both are nouns.

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

As nouns, line roulette is a hypernym of hypocycloid; that is, line 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
line roulette: a line generated by a point on one figure rolling around a second figure

Other hypernyms of hypocycloid include roulette.

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