finish off vs complete

finish off is not an adjective while complete is an adjective.

Word	Noun	Adjective	Verb	Adverb
finish off	No	No	Yes	No
complete	No	Yes	Yes	No

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

Other hypernyms of finish off include finish.

finish off (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

finish off (verb)	complete (verb)
finish a task completely	bring to a whole, with all the necessary parts or elements
	come or bring to a finish or an end
	write all the required information onto a form
	complete a pass
	complete or carry out