opt vs prefer

opt and prefer both are verbs.

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

As verbs, opt and prefer are synonyms defined as:

Other synonyms of opt include choose.

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