layover vs night-stop

layover and night-stop both are nouns.

Word	Noun	Adjective	Verb	Adverb
layover	Yes	No	No	No
night-stop	Yes	No	No	No

As nouns, night-stop is a hyponym of layover; that is, night-stop is a word with a more specific, narrower meaning than layover:

Other hyponyms of layover include pit stop, pit stop, stand.

layover (noun)	night-stop (noun)
a brief stay in the course of a journey	a break in a journey for the night