"surrogate" in the noun sense
1. surrogate, alternate, replacement
someone who takes the place of another person
2. deputy, surrogate
a person appointed to represent or act on behalf of others
"surrogate" in the adjective sense
1. foster, surrogate
providing or receiving nurture or parental care though not related by blood or legal ties
"foster parent"
"foster child"
"foster home"
"surrogate father"
Source: WordNet® (An amazing lexical database of English)
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