- stand-in, substitute, relief, reliever, backup, backup man, fill-in - someone who takes the place of another (as when things get dangerous or difficult); "the star had a stand-in for dangerous scenes"; "we need extra employees for summer fill-ins"
--1 is a kind of peer, equal, match, compeer
--1 has particulars:locum tenens, locum; double, stunt man, stunt woman; surrogate, alternate, replacement