rear lamp vs tail lamp

rear lamp and tail lamp both are nouns.

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

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

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

Other synonyms of rear lamp include rear light, taillight.

rear lamp (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