IPA: /ˈfeɪvərər/
KK: /ˈfeɪvərər/
A person who supports or prefers something or someone.
She is a favorer of environmental protection policies.
Favorer → It is formed from "favor" (from Old French *favor*, meaning goodwill or kindness) and "-er" (meaning a person who). A favorer is a person who shows goodwill or kindness towards others.
Think of someone who shows 'goodwill' ('favor') — the '-er' just means a person. A favorer is someone who is kind or helpful.