Scrabble

With seven-letter words being stacked from the middle in either direction until you get a 14×7 grid as demonstrated in the attached screenshot. How far is it possible to go until it becomes impossible to add more letters? (This diagram assumes that nobody has used their blank tiles yet.)

I feel like it's become difficult to find new players.

I did an oops. I looked up how to edit the tiles in Quackle to make a Scrabble game playable without the letter E, and the app decided to speak gibberish. I can assure you that there are thousands of words in English that don't use E, as evidenced by this link below. But, yeah, how do I fix this? Do I have to somehow update the entire English dictionary file? How do I open .dawg files?

https://boulter.com/anagram/?letters=aaaaaaaaaaaa+iiiiiiiiiiii+ooooooooooo+uuuuuu+yyy+bb+cc+dddd+ff+ggg+hh+j+k+llll+mm+nnnnnn+pp+q+rrrrrr+ssss+tttttt+vv+wwxyyz

EDIT: Revised the link.

FART is most certainly a real word that is prominent in the lexicon.

I am fully aware that this is not Scrabble and that as of late WWF has been struggling, but I haven't posted here in a long time and I wanted to wake it up.

I have to dig for it, but will post it when I find it.