Sir-Uli

This plugin provides a possibility to block comments based on words of a predefined list. The built-in lists of wordpress only allow to send comments to the moderation- or to the spam-queue but not to block them completely. This is remedied with this plugin, which allows to block comments based on a definable list.
Attention #1: Use wordlist with care, there is no logging of the blocked comments!
Attention #2: It will also match inside words, so “press” will match “WordPress” as well!

WU – Block comments

This plugin provides a possibility to block comments based on words of a predefined list.

Little Apps

If your WordPress website is getting spammed like crazy and nothing seems to be stopping them, then you need something that helps get rid of them once and for all. That’s where this plugin comes in that requires everyone to fill out a CAPTCHA before they can do anything on the WordPress website.

Humans Only

Stop your WordPress website from being spammed by bots and restrict it only to humans.

WU – Block comments vs Humans Only