turn signal vs turn indicator

turn signal and turn indicator both are nouns.

Word	Noun	Adjective	Verb	Adverb
turn signal	Yes	No	No	No
turn indicator	Yes	No	No	No

As nouns, turn signal and turn indicator are synonyms defined as:

turn signal and turn indicator: a blinking light on a motor vehicle that indicates the direction in which the vehicle is about to turn

Other synonyms of turn signal include blinker, trafficator.

turn signal (noun)	turn indicator (noun)
a blinking light on a motor vehicle that indicates the direction in which the vehicle is about to turn	a blinking light on a motor vehicle that indicates the direction in which the vehicle is about to turn