Words with 'ast' at the start and 's' at the end

What is the longest word you can assemble with this list?
The word 'asterospondylous' has 16 characters.

Is there an example word from this page which might be thought of as interesting?
Our favorite weird word from this list is 'astomatous'. According to the Oxford dictionary, 'astomatous' is defined as "Not possessing a mouth.".

What's the highest scoring word you can play in Scrabble ?
For 12 points, you could play 'asthmas'.

Which word that starts with 'ast' and ends with 's' is the most common word?
Our database notes that the most popular word in the dictionary that start with 'ast' and end with 's' is 'astronomers'.

How many acceptable words can you put together using the specified combination?
There are 67 words which cover all combinations.