tail lamp vs rear light

tail lamp and rear light both are nouns.

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

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

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

Other synonyms of tail lamp include rear lamp, taillight.

tail 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