Can I hide specific posts?

There is only "block user" or "block community", if neither of those buttons fit your need, you'll have to either block more than you want to block, or just ignore stuff manually. Getting practice ignoring stuff is a pretty useful skill on social media. Blocking leads to not being aware it exists, which is the right way to go in some cases. For other things, being aware they exist but not engaging with them is a better call.