Razakar (رضا کار) is etymologically an Arabic word which literally means volunteer. The word is also common in Urdu language as a loanword. On the other hand, in Bangladesh, razakar is a pejorative word meaning a traitor or Judas.
^Mookherjee, Nayanika (2009). Sharika Thiranagama, Tobias Kelly (ed.). Traitors: Suspicion, Intimacy, and the Ethics of State-Building. University of Pennsylvania Press. p. 49. ISBN978-0-8122-4213-3.