Words that start with 's' and contain 'iff'

How many viable words are possible to put together using this list?
It is possible to create 108 words with this list.

Which word in particular on this page has the largest character count?
'Superindifferently' is the longest word that Dictionarypedia could construct. It is made up 18 characters.

What's the most common word that starts with 's' and includes 'iff'?
There's 'stiff', which ranks as the 4360^th most popular word.

What is a weird word from all the word combinations available ?
One of the most weird words from this list of words that start with 's' and include 'iff' is 'sheriffdom'. The conventional definition of 'sheriffdom' is as follows: "The office or jurisdiction of sheriff. See Shrievalty.". Credit to the Oxford Dictionary.

What's the highest scoring word in Scrabble with the above combination ?
With the number of words to decide on, your best choice is 'squiffy' which scores 25 points.