1 a person who actively supports or favors a cause President Lyndon B. Johnson was a strong<strong> supporter</strong> of civil rights Synonyms for<strong> supporter</strong> advocate, advocator, apostle, backer, booster, champion, espouser, exponent, expounder, friend, gospeler (or gospeller), herald, hierophant, high priest, paladin, promoter, proponent, protagonist,
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