complete vs action

complete is not a noun while action is a noun.

Word	Noun	Adjective	Verb	Adverb
complete	No	Yes	Yes	No
action	Yes	No	Yes	No

As verbs, action is a hyponym of complete; that is, action is a word with a more specific, narrower meaning than complete:

As verbs, action is a hypernym of complete; that is, action is a word with a broader meaning than complete:

Other hypernyms of complete include accomplish, carry out, carry through, execute, fulfil, fulfill.

complete (noun)	action (noun)
	the most important or interesting work or activity in a specific area or field
	a judicial proceeding brought by one party against another; one party prosecutes another for a wrong done or for protection of a right or for prevention of a wrong
	something done (usually as opposed to something said)
	a military engagement
	an act by a government body or supranational organization
	the operating part that transmits power to a mechanism
	In firearms terminology, the mechanism that handles the ammunition (loads, locks, fires, and extracts the cartridges).
	the trait of being active and energetic and forceful
	the series of events that form a plot
	a process existing in or produced by nature (rather than by the intent of human beings)
	the state of being active

complete (adjective)	action (adjective)
having every necessary or normal part or component or step
having come or been brought to a conclusion
perfect and complete in every respect; having all necessary qualities
highly skilled
without qualification; used informally as (often pejorative) intensifiers

complete (verb)	action (verb)
bring to a whole, with all the necessary parts or elements	put in effect
come or bring to a finish or an end	institute legal proceedings against; file a suit against
write all the required information onto a form
complete a pass
complete or carry out