lay-by vs layby

lay-by and layby both are nouns.

Word	Noun	Adjective	Verb	Adverb
lay-by	Yes	No	No	No
layby	Yes	No	No	No

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

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

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

lay-by (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