surrogate

Noun
  1. Someone who takes the place of another person (synset 110699600)
    is a type of: backup, backup man, fill-in, relief, reliever, stand-in, substitute - someone who takes the place of another (as when things get dangerous or difficult)
    same as: alternate, replacement
  2. A person appointed to represent or act on behalf of others (synset 110025383)
    is a type of: agent - a representative who acts on behalf of other persons or organizations
    subtypes: vicegerent - someone appointed by a ruler as an administrative deputy
    same as: deputy
Adjective
  1. Providing or receiving nurture or parental care though not related by blood or legal ties (synset 301409390)
    "foster parent"; "foster child"; "foster home"; "surrogate father"
    similar to: adoptive - of parents and children; related by adoption
    same as: foster

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