inspection vs checkout

inspection and checkout both are nouns.

Word	Noun	Adjective	Verb	Adverb
inspection	Yes	No	No	No
checkout	Yes	No	No	No

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

Other hyponyms of inspection include check-out procedure, check.

inspection (noun)	checkout (noun)
a formal or official examination	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