rear light vs tail lamp

rear light and tail lamp both are nouns.

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

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

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

Other synonyms of rear light include rear lamp, taillight.

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