rear lamp vs rear light

rear lamp and rear light both are nouns.

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

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

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

Other synonyms of rear lamp include tail lamp, taillight.

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