Words with 'def' at the start and 'n' at the end

What's the longest word you can construct with this list?
The longest word is 19 letters, which is 'defunctionalization'.

What's the total number of words one can create using this list?
One can derive 37 words from the combination of words that start with 'def' and end with 'n'.

What is an interesting word from the combinations available on this page?
One of the most strange words from this list is 'defraudation'. 'Defraudation' is defined as "The act of defrauding; a taking by fraud. [R.] Sir T. Browne.", according to the dictionary.

In Scrabble, what is the highest possible score possible from this list of words with 'def' at the start and 'n' at the end?
Our recommendation for a total score of 12 points is playing the word 'defusion'.

Which word that starts with 'def' and ends with 'n' is the most common word in the dictionary?
Rating as the 8387^th most common word, you'll want to ensure that you've got 'definition' in your arsenal.