Main entry: replacement, substitute
Definition: a person or thing that takes or can take the place of another
Main entry: stand-in, substitute, relief, reliever, backup, backup man, fill-in
Definition: someone who takes the place of another (as when things get dangerous or difficult)
Usage: the star had a stand-in for dangerous scenes; we need extra employees for summer fill-ins
Main entry: substitute, reserve, second-stringer
Definition: an athlete who plays only when a starter on the team is replaced
Main entry: exchange, replace, interchange, substitute
Definition: put in the place of another; switch seemingly equivalent items
Usage: the con artist replaced the original with a fake Rembrandt; substitute regular milk with fat-free milk; synonyms can be interchanged without a changing the context's meaning
Main entry: substitute, sub, fill in, stand in
Definition: be a substitute
Usage: The young teacher had to substitute for the sick colleague; The skim milk substitutes for cream--we are on a strict diet
Main entry: deputise, deputize, step in, substitute
Definition: act as a substitute
Usage: She stood in for the soprano who suffered from a cold
Main entry: substitute, ersatz
Definition: artificial and inferior
Usage: ersatz coffee; substitute coffee
Main entry: alternate, alternative, substitute
Definition: serving or used in place of another
Usage: an alternative plan
Main entry: substitute, utility
Definition: capable of substituting in any of several positions on a team
Usage: a utility infielder