Words that start with 'hyd' and contain 'n'

Which is the most unusual word that starts with 'hyd' and includes 'n'?
There are many unusual words on this page, although our favorite word right now is 'hydrobiplane'. It means "A hydro-aëroplane having two supporting planes.".

What's the highest number of points you could get in Scrabble using this list of words that start with 'hyd' and contain 'n'?
As there are a massive 255 entries, we would advise picking 'hydrazin' scoring 24 points.

How many characters does the longest word on this list contain?
The longest word that's possible to derive from the combination specified is 'hydroxydehydrocorticosterone', and it consists of 28 characters.

How many viable words are possible to put together from this combination of letters?
It is possible to make 255 words using the specified combination.

What's the most popular word that starts with 'hyd' and includes 'n' in the dictionary?
There's 'hydrogen' which is the 17625^th most common word.