checkout vs time of departure

checkout and time of departure both are nouns.

Word	Noun	Adjective	Verb	Adverb
checkout	Yes	No	No	No
time of departure	Yes	No	No	No

As nouns, time of departure is a hypernym of checkout; that is, time of departure is a word with a broader meaning than checkout:

checkout: the latest time for vacating a hotel room
time of departure: the time at which a public conveyance is scheduled to depart from a given point of origin

Other hypernyms of checkout include departure time.

checkout (noun)	time of departure (noun)
the act of inspecting or verifying	the time at which a public conveyance is scheduled to depart from a given point of origin
a counter in a supermarket where you pay for your purchases
the latest time for vacating a hotel room