IPA: /ˈkwɔːrələr/
KK: /ˈkwɔrələr/
A person who often argues or fights with others.
He is known as a quarreler, always finding something to argue about.
Quarreler → It is formed from "quarrel" (from Old French *quarrel*, meaning a dispute or argument) and "-er" (meaning a person who). A quarreler is a person who engages in disputes or arguments.
Think of someone who is involved in a 'dispute' ('quarrel') — the '-er' just means a person. A quarreler is someone who often gets into arguments.