Words with 'du' at the start and 'd' at the end

What's the max number of words one can assemble using this combination of letters?
From this list of words with 'du' at the start and 'd' at the end, there are 70 outstanding entries that are possible.

What's the longest word you can construct with this list?
Consider 'dunderheaded'

Is there a word on this page that jumps out as the most common?
As far as well-known words go, there's 'dulled' which ranks as the 27683^rd most common word.

Is there a word from this page which could be deemed as unusual?
One of the most strange words from this list of words that start with 'du' and end with 'd' is 'dulcified'. It is defined as "Sweetened; mollified. Dulcified spirit or spirits, a compound of alcohol with mineral acids; as, dulcified spirits of niter.".

In Scrabble, what's the most points you can get using this list of words with 'du' at the start and 'd' at the end?
Using this particular combination, it is possible to play 'dualized' for a total of 19 points in Scrabble.