Words with 'hy' at the start and 'a' at the end

Which word from this page is the most interesting?
We feel that 'hypoderma' to be the most peculiar word. It is defined as "1. (Bot.) A layer of tissue beneath the epidermis in plants, and performing the physiological function of strengthening the epidermal tissue. In phanerogamous plants it is developed as collenchyma. 2. (Zoöl.) An inner cellular layer which lies beneath the chitinous cuticle of arthropods, annelids, and some other invertebrates.".

Is there a word on this page that jumps out as the most common?
We've discovered that 'hysteria' is the 33554^th most common word.

How many characters are in the largest word from this list?
The word 'hypercholesterinemia' is made up of 20 characters.

What's the total number of words you can put together using this list?
You can go with up to 323 entries that cover all variations.

What's the highest number of points you're able to get in Scrabble from this list of words with 'hy' at the start and 'a' at the end?
As there are a considerable 323 entries, we would recommend picking 'hydrozoa' scoring 24 points.