prefer vs advantage

prefer is not a noun while advantage is a noun.

Word	Noun	Adjective	Verb	Adverb
prefer	No	No	Yes	No
advantage	Yes	No	Yes	No

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

prefer (noun)	advantage (noun)
	the quality of having a superior or more favorable position
	benefit resulting from some event or action
	(tennis) first point scored after deuce

prefer (verb)	advantage (verb)
select as an alternative over another	give an advantage to
like better; value more highly
promote over another
give preference to one creditor over another