Words with 'ko' at the start and 'x' at the end

In Scrabble, what's the highest number of points possible from this list of words that start with 'ko' and end with 'x'?
With sadly 1 entry offered, you are obligated to use 'kordax' for a score of 18 points.

What is the maximum number of words you are able to put together using words that start with 'ko' and end with 'x'?
Oh dear, it is only possible to only make 1 word using the combination of words that start with 'ko' and end with 'x'.