You might want to limit the type of language that you allow your users to post in their comments. By accessing the Words tab within your Moderation Dashboard, you can easily place restrictions on comments that contain whichever words you’d like.

Moderation Settings - WordsModeration Settings – Words

Simply head to Words and add however many words you’d like, separated by commas. You can then add a “restriction,” either requiring approval for comments containing those words, or rejecting them outright.