option vs opt

option is a noun but opt is not a noun.

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

option (noun)	opt (noun)
the act of choosing or selecting
one of a number of things from which only one can be chosen
the right to buy or sell property at an agreed price; the right is purchased and if it is not exercised by a stated date the money is forfeited

option (verb)	opt (verb)
	select as an alternative over another