Which word in particular on this page has the highest character count?The biggest word one can construct from words that start with 'hya' and end with 't' is 'hyalobasalt', and it has 11 characters.
In total, how many words is it possible to make using this combination of letters?From this page of words with 'hya' at the start and 't' at the end, you have 3 outstanding combinations that are possible in total.