line roulette vs roulette

line roulette and roulette both are nouns.

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

As nouns, line roulette and roulette are synonyms defined as:

line roulette and roulette: a line generated by a point on one figure rolling around a second figure

line roulette (noun)	roulette (noun)
a line generated by a point on one figure rolling around a second figure	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