rest area vs rest stop

rest area and rest stop both are nouns.

Word	Noun	Adjective	Verb	Adverb
rest area	Yes	No	No	No
rest stop	Yes	No	No	No

As nouns, rest area and rest stop are synonyms defined as:

rest area and rest stop: designated paved area beside a main road where cars can stop temporarily

Other synonyms of rest area include lay-by, layby, pull-off.

rest area (noun)	rest stop (noun)
designated paved area beside a main road where cars can stop temporarily	designated paved area beside a main road where cars can stop temporarily