IPA: /ˈeɪliəˌneɪtə/
KK: /ˈeɪliəˌneɪtər/
A person who causes someone to feel isolated or estranged from a group or situation.
The alienator created a rift between the friends, causing them to drift apart.
Alienator → It is formed from "alien" (from Latin "alienus", meaning belonging to another) and "-ator" (a suffix used to indicate a person who performs a specific action). The word "alienator" refers to a person who causes someone to become estranged or to belong to another group.
Think of someone who makes another person feel like they belong to 'another' ('alien') group — that's what an alienator does.