Words that contain 'di' and end in 'fs'

Bad news, only 3 words are available for this particular combination.

8 letter words

  • distaffs

9 letter words

  • disproofs

10 letter words

  • disbeliefs

Which word from this list has the highest character count?

What's the max number of words one is able to create from this combination of letters?
From this list of words containing 'di' and ending with 'fs', there are 3 brilliant entries which are available.

What is the highest scoring word in Scrabble you can play for ?
As there is unfortunately to pick from, you can only use 'distaffs' which scores 15 points.