Words with 's' as the first letter that end with 'st'

What is a peculiar word from all the word combos available on this page?
One of the most peculiar words from this list is 'stundist'. According to the Oxford dictionary, 'stundist' means "One of a large sect of Russian dissenters founded, about 1860, in the village of Osnova, near Odessa, by a peasant, onishchenko, who had apparently been influenced by a German sect settled near there. They zealously practice Bible reading and reject priestly dominion and all external rites of worship. --...".

How many characters does the longest word from this list consist of?
The longest word assembled by Dictionarypedia is 'superindividualist'.

What's the highest scoring word in Scrabble you can play for ?
With a massive 783 entries, you should go for 'skyplast' scoring 17 points.

Is there any word on this page that sticks out as the most common?
Ranking as the 3338^th most popular word, you will want to ensure that you have 'slightest' in your repertoire.

What is the total number of words one is able to put together from this list?
All in all, you'll find 783 words.