IPA: //ˈkaʊntərˌproʊtɛst//
KK: /ˈkaʊntərˌproʊtɛst/
A demonstration or gathering of people that takes place to show disagreement with another protest.
The counterprotest aimed to express support for the original cause.
Counterprotest → It is formed from "counter-" (meaning against) and "protest" (from Latin "protestari", meaning to bear witness or declare publicly). The word "counterprotest" refers to a protest that is organized in opposition to another protest.
Think of standing 'against' ('counter-') a public declaration ('protest') — that's what a counterprotest means.
No commonly confused words.