Based on what exactly? How do you even begin to scale these two, let alone make such a grand claim? Lifebringer alone can't even be correctly measured based on what his role became at that period in Marvel cosmology. I'm not saying that you're wrong, I'm saying good luck proving it.
My point was that Lifebringer could not be quantified because his station in Marvel cosmology had risen. Order and Chaos became more powerful than the Living Tribunal, and on and on... At that point Lifebringer could have been more powerful than the Word because there was no way to substantially quantify him.