Wouldn't that be Powser and Beach?

Also, this whole naming thing is way off, isn't it? (I mean, what the internet has come up with, not what you've come up with, Lilac :} )

As far as I understand it, it's that Toadette acquires / consumes a crown-mushroom and becomes Peachette. That name implies that a level of Peachness is applied to Toadette. It's a powerup that makes someone more like Peach.

So when Bowser acquires/consumes a crown mushroom, one should add PEACH to the name BOWSER, and the 'Ette' from 'Toadette' shouldn't be present at all, because Toadette was never part of the equation. So if you apply the 'Peach' part to the front of the name as was done with Peachette, the Bowser+Crownshroom thing should be Peachser or Peacher.

But yes, THEN, if there was some kind of Bowser-Mushroom and Peach got it, that would be.. Bowseach. Or 'Beach'

I'm not even sure, this is like theoretical physics, almost.