I’m told there’s a nip already
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maybe this? 
It would allow you to add words to your mute list. but not really follow other peoples word mute lists
GitHub
Specifies a hide keyword tag into Mute Lists by vitorpamplona · Pull Request #673 · nostr-protocol/nips
Users can add keywords to their Mute list and Clients can then filter posts that contain those keywords out of the view.