rest stop vs lay-by

rest stop and lay-by both are nouns.

Word	Noun	Adjective	Verb	Adverb
rest stop	Yes	No	No	No
lay-by	Yes	No	No	No

As nouns, rest stop and lay-by are synonyms defined as:

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

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

rest stop (noun)	lay-by (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