How do you spell superific as in super and terrific merged into one shorter word?

There's no official spelling for "superific" as a blend of "super" and "terrific". It's not a word found in dictionaries.

However, if you want to create a word like this, here are a few options:

* Superific (This is what you suggested, and it's a good starting point.)

* Superrific

* Superffic

Ultimately, the spelling is up to you! You could even use "super-terrific" if you prefer.