Alternative.
Synonyms:
choice, election, option, pick, preference, resource.
A choice may be among many things; an alternative is in the strictest sense a choice between two things; oftener it is one of two things between which a choice is to be made, and either of which is the alternative of the other; as, the alternative of surrender is death; or the two things between which there is a choice may be called the alternatives; both Mill and Gladstone are quoted as extending the meaning of alternative to include several particulars, Gladstone even speaking of "the fourth and last of these alternatives." Option is the right or privilege of choosing; choice may be either the right to choose, the act of choosing, or the thing chosen. A person of ability and readiness will commonly have many resources. Pick, from the Saxon, and election, from the Latin, picture the objects before one, with freedom and power to choose which he will; as, there were twelve horses, among which I could take my pick. A choice, pick, election, or preference is that which suits one best; an alternative is that to which one is restricted; a resource, that to which one is glad to betake oneself.
Antonyms:
compulsion, necessity.