Here are a few options, depending on the specific context:
Rhyming, but not quite the same meaning:
* "Greater": This is a close rhyme, but doesn't necessarily imply a more serious betrayal.
* "Creator": This is a distant rhyme, but suggests a more powerful or influential figure, which could be seen as a contrast to a traitor.
Similar meaning, but not rhyming:
* "Betrayer": This is a more direct synonym for "traitor," but doesn't rhyme.
* "Renegade": This word suggests a more rebellious or independent betrayal, perhaps with a more complex motivation.
* "Deceiver": This implies a more cunning or manipulative betrayal.
Ultimately, the best word depends on the specific context and nuance you want to convey.