Mastodon lets you set up custom timeline filters which automatically CW or completely hide posts with a specific word or phrase.
To add a filter:
1. Log in through your server’s website
2. Go to ⚙️ Preferences > Filters (On the mobile website click ⚙️ then ☰ then Filters
3. Click Add new filter button
4. Choose the settings you want, then click Save New Filter
There are nuances to using the filters, and I've done a list of tips about them at:
➡️ https://fedi.tips/filtering-your-timeline-to-hide-posts-on-mastodon/
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