checkout vs spot check

checkout and spot check both are nouns.

Word	Noun	Adjective	Verb	Adverb
checkout	Yes	No	No	No
spot check	Yes	No	No	No

As nouns, spot check is a hyponym of checkout; that is, spot check is a word with a more specific, narrower meaning than checkout:

checkout: the act of inspecting or verifying
spot check: a check on work performance or product quality made at random times without warning

checkout (noun)	spot check (noun)
the act of inspecting or verifying	a check on work performance or product quality made at random times without warning
a counter in a supermarket where you pay for your purchases
the latest time for vacating a hotel room