In which case, the irony would be that the Carrionites would be unable to affect it, thus affecting it themselve sin a case of double-irony. Thus the Irony would be lost.

I think I just blew my own mind.

Now, manipulating a Word World, on the other hand... Carrionite OP nerf nao. =]

The Ironic Overpower doesn't use your words against you. It enforces comedic clichés. So carrionites would be just as susceptible as anyone else.
Now, if you'd said an OotS bard, I could see it.

I'd say that the Carrionites' word-based science will be affected by the IO just like everything else and will be messed with just like anything else.