IPA: /ˈbænɪʃər/
KK: /ˈbænɪʃər/
A person who forces someone or something to leave a place or to be removed.
The banisher sent the unwanted spirits away from the village.
Banisher → It is formed from "banish" (from Old French *banir*, meaning to exile or drive away) and "-er" (meaning a person who). A banisher is a person who drives someone away or exiles them.
Think of someone who 'drives away' ('banish') others — the '-er' indicates that this person is the one doing the action.