There are thousands of -ists and even more -isms, and these words are double-edged swords. On the one hand, labeling a group — be they nationalists, white supremacists, racists — gives it legitimacy and power. An identifiable group can more easily recruit adherents and spread hate.
A word-loving reader recently inquired why, when playing Scrabble on Facebook, her opponent was able to play the word JEWED — a highly offensive term for bargaining. The word doesn’t appear in her published Scrabble dictionary, and yet it was permitted by the computer.