· a person or thing that takes or can take the place of another

Synonym(s): replacement

Hypernym(s): equivalent

· an athlete who plays only when a starter on the team is replaced

Synonym(s): reserve, second-stringer

Hypernym(s): athlete, jock

· 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"

Synonym(s): stand-in, relief, reliever, backup, backup_man, fill-in

Hypernym(s): peer, equal, match, compeer

· put in the place of another; switch seemingly equivalent items; "the con artist replaced the original with a fake Rembrandt"; "substitute regular milk for fat-free milk"; "synonyms can be interchanged without a changing the context's meaning"

Synonym(s): replace, interchange, exchange

Hypernym(s): change, alter, modify

· be a substitute; "The young teacher had to substitute for the sick colleague"; "The skim milk substitutes for cream--we are on a strict diet"

Synonym(s): sub, stand_in, fill_in

Hypernym(s): exchange, change, interchange

· act as a substitute; "She stood in for the soprano who suffered from a cold"

Synonym(s): deputize, deputise, step_in

Hypernym(s): supplant, replace, supersede, supervene_upon

· capable of substituting in any of several positions on a team; "a utility infielder"

Synonym(s): utility

· serving or used in place of another; "an alternative plan"

Synonym(s): alternate, alternative

· artificial and inferior; "ersatz coffee"; "substitute coffee"

Synonym(s): ersatz