rear light vs rear lamp

rear light and rear lamp both are nouns.

Word	Noun	Adjective	Verb	Adverb
rear light	Yes	No	No	No
rear lamp	Yes	No	No	No

As nouns, rear light and rear lamp are synonyms defined as:

rear light and rear lamp: lamp (usually red) mounted at the rear of a motor vehicle

Other synonyms of rear light include tail lamp, taillight.

rear light (noun)	rear lamp (noun)
lamp (usually red) mounted at the rear of a motor vehicle	lamp (usually red) mounted at the rear of a motor vehicle