IPA: /ˌɛks.kəˈmjun.ɪ.keɪ.tər/
KK: /ˌɛkskəˈmjunɪˌkeɪtər/
A person who officially excludes someone from participation in a religious community or organization.
The excommunicator declared that the member was no longer welcome in the church.
Excommunicator → It is formed from "ex-" (meaning out of or from) and "communicare" (meaning to share or to make common). The word refers to someone who expels or removes a person from the community, particularly in a religious context.
Think of someone who is sending someone 'out of' ('ex-') the community or group ('communicare'). This helps you remember that an excommunicator is someone who removes a person from a community.