guest vs no-show

guest and no-show both are nouns.

Word	Noun	Adjective	Verb	Adverb
guest	Yes	No	No	No
no-show	Yes	No	No	No

As nouns, no-show is a hyponym of guest; that is, no-show is a word with a more specific, narrower meaning than guest:

guest: a customer of a hotel or restaurant etc.
no-show: a guest who fails to notify a hotel or restaurant when canceling a reservation

Other hyponyms of guest include overnighter.

guest (noun)	no-show (noun)
(computer science) any computer that is hooked up to a computer network	someone who shirks duty
a visitor to whom hospitality is extended	a guest who fails to notify a hotel or restaurant when canceling a reservation
a customer of a hotel or restaurant etc.