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

Which word that starts with 'd' and includes 'one' is the most common word in the dictionary?
The most popular word is 'done', which is actually the 255^th most common word in this list.

How many letters does the longest word on this list contain?
There are 21 characters in the word 'dehydrocorticosterone', which makes it the longest word we have.

In total, how many words are there using this combination of letters?
One could make 171 words with this combination.

What is a peculiar word from this list of words that start with 'd' and include 'one'?
The most peculiar word in this list is 'dethrone'. It is defined as "To remove or drive from a throne; to depose; to divest of supreme authority and dignity. "The Protector was dethroned." Hume.".

What is the highest score you're able to get in Scrabble using this list of words starting with 'd' that contain 'one'?
As there are plenty of words to pick from, your best bet is 'dyophone' scoring 17 points.