1. (Common Noun-Common) One who promotes or advocates and adheres to an ideology.

English: adherent, admirer, advocate, promoter, seconder, supporter,
Assamese: অনুধাৱক, অনুমোদক, সমৰ্থক, সমৰ্থনকাৰক, সমৰ্থনকাৰী,
Garo: ma.gapgipa

Different POS:

a. Verbal Noun: promotion, উত্তৰণ, পদোন্নতি, doatani, Famkaba...
b. Abstract Noun: support, সপক্ষ, সমৰ্থন, হয়ভৰ, chedon...