rest stop vs layby

rest stop and layby both are nouns.

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

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

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

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

rest stop (noun)	layby (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