checkout vs check-out procedure

checkout and check-out procedure both are nouns.

Word	Noun	Adjective	Verb	Adverb
checkout	Yes	No	No	No
check-out procedure	Yes	No	No	No

As nouns, checkout and check-out procedure are synonyms defined as:

Other synonyms of checkout include check.

checkout (noun)	check-out procedure (noun)
the act of inspecting or verifying	the act of inspecting or verifying
a counter in a supermarket where you pay for your purchases
the latest time for vacating a hotel room