IPA: //ˌɡʌvərˈmɛn.təl.ɪst//
KK: /ˈɡʌvərnˌmɛntəlɪst/
A person who supports or advocates for the idea that government should play a significant role in society and the economy.
The governmentalist argued for more government intervention in public services.
Governmentalist → It is formed from "government" (from Old French *governer*, meaning to direct or control) and "-alist" (meaning one who practices or advocates). The word refers to a person who advocates for or supports a particular form of government or governance.
Think of someone who 'advocates' ('-alist') for a specific way to 'direct' ('governer') a society — that's what a governmentalist does.