How many words are possible to put together using the combination specified?From this list of words that start with 'ist' and include 'd', you have 3 entries that are possible.
How many letters are in the longest word on this page?The word 'istiophoridae' contains 13 characters.
What's the highest scoring word you can play in Scrabble ?With sadly hardly any words possible, you're only viable option is 'isthmoid' for a score of 14 points.