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

What's the highest possible score you're able to get in Scrabble using this list of words starting with 's' that contain 'lb'?
For a total of 19 points in Scrabble, you could play 'spillbox'.

Which word that starts with 's' and includes 'lb' is the most common word in the dictionary?
The most common word in the dictionary is 'schoolboy', which is in fact the 19700^th most popular word in the dictionary.

How many words is it possible to make using these particular combinations of letters?
From this page of words that start with 's' and contain 'lb', you have 82 entries that are possible in total.

Is there an example word from this page which might be considered as unique?
The most weird word based on a recently conducted poll is 'seralbumen'. The dictionary defines it as "Serum albumin.".

How many letters does the longest word on this list consist of?
The biggest word one could derive from this list is 'schoolboyishness', which contains 16 characters.