What's the highest scoring word you can play in Scrabble ?As there is just 4 results possible, your only feasible choice is 'kinboot' scoring 13 points.
How many characters are in the longest word on this list?The largest word is 7 characters, which is 'kinboot'.
How many words can you put together using the specified combination?From this list of words that start with 'k' and contain 'nb', you have 4 effective entries that can be selected.