action vs complete

action is a noun but complete is not a noun.

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

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

Other hypernyms of action include finish, effect, effectuate, set up.

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

Other hyponyms of action include get over, run, consummate, consummate, do, perform, discharge, dispatch.

action (noun)	complete (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

action (adjective)	complete (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

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