n. 25B6; adjective
an alternative route : DIFFERENT, other, another, second, possible, substitute, replacement; standby, emergency, reserve, back-up, auxiliary, fallback; N. Amer. alternate.
an alternative lifestyle : UNORTHODOX, unconventional, non-standard, unusual, uncommon, out of the ordinary, radical, revolutionary, nonconformist, avant-garde; informal off the wall, oddball, offbeat, way-out.
25B6; noun we have no alternative : OPTION, choice, other possibility; substitute, replacement.