IPA: /ɪkˈskluːzɪst/
KK: /ɪkˈsklusɪvɪst/
A person who supports the idea that only a particular group or belief is valid, often excluding others.
The exclusivist argued that only their interpretation of the doctrine was correct.
Exclusivist → It is formed from "exclusus" (from Latin, meaning shut out) and "-ist" (meaning a person who practices or advocates). The word "exclusivist" refers to a person who advocates for the exclusion of others or certain groups.
Think of someone who believes in 'shutting out' ('exclusus') others — that's why an exclusivist is someone who supports exclusion.
No commonly confused words.