WordNet: verifier, voucher

someone who vouches for another or for the correctness of a statement

• hypernym admirer, booster, champion, friend, protagonist, supporter

verifier

• (englanti) verify (derivationally related)
• (suomi) todistaja (synonyymi)

voucher

• (englanti) vouch (derivationally related)

• (englanti) vouch (derivationally related)
• (suomi) todistaja (synonyymi)