What if someone else wrote lyrics in my song?

Suno is best suited for making new music with new lyrics. If you're working with another writer, you must obtain permission for any lyrics or other content you use in your songs.

In this case, the lyricist will own those lyrics, and you simply have permission to use the song. Before exploring commercial opportunities, you may want to revisit your contract with the lyric owners to ensure you have the rights, and know if you need to split royalties!