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

How many characters are in the largest word on this list?
The word 'diadochokinesia' contains 15 characters.

Is there an example word from this page which might be thought of as interesting?
The most unusual word in our opinion is 'diadem'. The dictionary defines it as "1. Originally, an ornamental head band or fillet, worn by Eastern monarchs as a badge of royalty; hence (later), also, a crown, in general. "The regal diadem." Milton. 2. Regal power; sovereignty; empire; -- considered as symbolized by the crown. 3. (Her.) An arch rising from the rim of...".

Which word that starts with 'dia' and includes 'd' is the most common word?
We've identified that 'diamonds' is the 7293^rd most common word.

In total, how many words are possible to make using this list?
From this page of words that start with 'dia' and contain 'd', Dictionarypedia has found 107 outstanding entries which can be selected.

What is the highest score you could get in Scrabble from this list of words starting with 'dia' that contain 'd'?
As there are so many words to decide on, we would recommend going for 'dialyzed' which scores 22 points.