In total, how many words are available using the combination of letters specified?There are up to 2 words which address your query.
In Scrabble, what's the highest number of points you can get using words starting with 'c' that contain 'gai'?With sadly a small amount of words available, your only feasible choice is 'congaing' scoring 12 points.
How many letters does the longest word on this list contain?The largest word you could construct from this list is 'cunningaire', and it contains 11 characters.