IPA: /fəˈmɛntər/
KK: /fɔˈmɛntər/
A person who encourages or stirs up something, often in a negative or disruptive way.
The fomenter of the protest rallied the crowd to demand change.
Fomenter → It is formed from "fomentare" (meaning to warm or soothe) and the suffix "-er" (meaning a person who). The word refers to a person who instigates or encourages something, often in a negative context, like trouble or unrest.
Think of someone who 'warms up' ('fomentare') a situation, encouraging it to grow, which is why a fomenter is someone who instigates or stirs up trouble.