Words that start with 'duo' and contain 's'

In Scrabble, what is the most points you can get from this list of words that start with 'duo' and contain 's'?
For a score of 14 points in Scrabble, you could use 'duopsony'.

How many letters does the longest word on this page contain?
The biggest word on this list is 'duodenocholecystostomy'. It has 22 characters.

In total, how many words are available using this list?
From this list of words that start with 'duo' and contain 's', you have 30 effective entries that are available altogether.