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surrogate
noun
°A substitute (usually of a person, position or role).
°A person or animal that acts as a substitute for the social or pastoral role of another, such as a surrogate mother.
adjective
°Of, concerning, relating to or acting as a substitute.
verb
°To replace or substitute something with something else; appoint a successor.
synonyms: deputize, foster, replace, subrogate more» , substitute