How many characters are in the longest word on this list?The biggest word that's possible to assemble from the specified combination is 'reformanda', and it has 10 characters.
How many possible words can you make using the combination specified?You can go with up to 4 entries.
In Scrabble, what is the highest score possible using words beginning with 'ref' and ending with 'a'?Since there are only 4 combinations to pick from, you are obligated to go with 'referda' scoring 11 points.