roulette vs line roulette

roulette and line roulette both are nouns.

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

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

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

roulette (noun)	line roulette (noun)
a gambling game in which players bet on which compartment of a revolving wheel a small ball will come to rest in	a line generated by a point on one figure rolling around a second figure
a wheel with teeth for making a row of perforations
a line generated by a point on one figure rolling around a second figure