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

In Scrabble, what is the highest score possible using words that start with 'kaf' and include 's'?
For 17 points, one can use 'kaffirs'.

What's the biggest word you can construct with the combination specified?
The largest word is 13 characters, which is 'kaffeeklatsch'.

What is the total number of words you could construct using this combination of letters?
On this list of words that start with 'kaf' and include 's', there are 6 effective entries which can be selected.