Words that contain 'et' and end in 'sy'

Unfortunately just 3 words are available for the combination requested.

5 letter words

  • betsy

12 letter words

  • metamorphosy

13 letter words

  • metamorphopsy

What is the highest scoring word in Scrabble using the above combination ?
Given there a small amount of words to pick from, your only feasible choice is 'betsy' scoring 10 points.

In total, how many possible words can you make using this combination of letters?
From this page of words that contain 'et' and end in 'sy', you have 3 combinations that can be selected.

Which word on this page has the largest letter count?
Consider 'metamorphopsy', which is made up of 13 letters.