advocator
Noun
Meaning
a person who pleads for a cause or propounds an idea
Source: WordNetSynonyms
exponent
advocate
proponent
apostle
herald
democrat
paladin
tribune
indexer
friend
fan
champion
protagonist
missionary
defender
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Antonyms
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Examples
Be careful to have truthful friends and try to obtain them, for they are your support when you are in welfare, and your advocator when you have misfortune.