What is the highest scoring word in Scrabble you can play for ?The only choice is 'troppaia' which scores 12 points.
What's the biggest word you can construct from the combination specified?The largest word one could construct from this combination is 'tulkepaia', and it is made up of 9 characters.
In total, how many possible words can you make using the combination requested?From this page of words beginning with 't' and ending with 'aia', Dictionarypedia has found 4 combinations that can be selected.