Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun endorser

2 senses of endorser

Sense 1
subscriber, endorser, indorser, ratifier -- (someone who expresses strong approval)
       => supporter, protagonist, champion, admirer, booster, friend -- (a person who backs a politician or a team etc.; "all their supporters came out for the game"; "they are friends of the library")

Sense 2
endorser, indorser -- (a person who transfers his ownership interest in something by signing a check or negotiable security)
       => signer, signatory -- (someone who signs and is bound by a document)