(noun) substitution, permutation, transposition, replacement, switch an event in which one thing is substituted for another Synonyms: reversal , refilling , replacing , exchange , commutation , renewal , switch , substitution , replenishment , surrogate , heterotaxy , successor , switching , shift , replacement , alternate , permutation , electrical switch , transposition , substitute , electric switch (noun) substitute, replacement a person or thing that takes or can take the place of another Synonyms: fill-in , substitution , refilling , relief , successor , replacing , backup , renewal , backup man , reliever , second-stringer , transposition , permutation , surrogate , reserve , replacement , alternate , replenishment , stand-in , switch , substitute http://www.synonyms.net/synonym/replacement