In total, how many words is it possible to make using these specific combinations of letters?There are a maximum of 2 entries which address your query.
In Scrabble, what's the most points you can get from words that start with 'db' and include 'm'?Since there are only 2 entries to pick from, your only viable choice is 'dbms' which scores 9 points.
Which word in particular on this page has the highest letter count?The longest word is 10 letters, which is 'dbridement'.