@aprilbear At the moment, we don't have the option to filter out all songs with lyrics on Pandora stations.
I recommend upvoting this existing feature request with a ❤️ if you'd like to see this option added to the service: Instrumental tracks only
For complete control of what you hear on Pandora, try Pandora Premium. It combines our radio service with on-demand listening and allows you to create custom playlists, so you can create full playlists with only instrumental music. Use this link to learn about the many benefits of upgrading. In the meantime, you can find instrumental stations and playlists by searching for "instrumental." You can also try creating stations based on a number of artists or individual songs that exemplify the sound you are looking for (e.g., songs without lyrics). You can add multiple artists or songs to a station using our Add Variety feature.
Hope this helps!
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