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

How many letters does the longest word on this page contain?
'Ischiocavernosus' is the longest word that the Dictionarypedia database could find.

What's the most common word on this page?
When it comes to popular words, there's 'islands' which ranks as the 2686^th most popular word.

In total, how many words are possible to make using these particular combinations of letters?
From this list of words beginning with 'is' and ending with 's', you have 150 effective entries that are possible in total.

What is the most interesting word that starts with 'is' and ends with 's'?
An example of a strange word from this page is 'isospondylous'. The typical definition of 'isospondylous' is as follows: "Of or pertaining to the Isospondyli; having the anterior vertebræ separate and normal.".

What is the highest number of points you could get in Scrabble from this list of words with 'is' at the start and 's' at the end?
Given there are an enormous 150 entries, we would advise selecting 'isozymes' scoring 22 points.