Synonyms of proponent

1 Syllable

friend

2 Syllables

champion, champions, placers, backer, second, patron

3 Syllables

abider, enthusiast, espouser, apostle, supporters, subscriber, partisan, proposer, upholder, expounder, protector, supporter, exponent, proposers, defender, seconder

4 Syllables

advocate, apologist, propagandist, vindicator, advocator, spokesperson