How many characters does the largest word on this list consist of?The longest word that's possible to assemble from words that start with 'k' and end with 'ei' is 'koschei', which consists 7 characters.
What's the highest scoring word you can play in Scrabble ?As there are only attainable, you're only viable option is 'koschei' scoring 16 points.
How many words could one put together using this list?You could make 3 words with the letter combination you searched for.