Words that start with 'd' and contain 'tsu'

What is the longest word you can construct with words that start with 'd' and include 'tsu'?
The longest word is 8 letters, which is 'daibutsu'.

In Scrabble, what is the highest number of points possible using words that start with 'd' and include 'tsu'?
With 3 entries available, the only choice you can go for is 'daibutsu' which scores 11 points.

In total, how many words is it possible to make using these specific combinations of letters?
You can create 3 words from the specified letter combination.