Words that start with 'sy' and contain 'u'

What is the most common word that starts with 'sy' and includes 'u' in the dictionary?
As far as popular words go, there's 'synonymous', which is the 8489^th most common word.

How many letters are in the biggest word on this list?
The largest word that's possible to derive from this list is 'symphyostemonous', which has 16 characters.

In Scrabble, what is the most points you can get using this list of words that start with 'sy' and contain 'u'?
With numerous words to select from, you'll want to opt for 'syzygium' scoring 26 points.

Is there an example of a word from this page of word that starts with 'sy' and includes 'u' which could be thought of as interesting in any regard?
The most interesting word from this list is surely 'synochus'. The dictionary defines it as "A continuous fever. [Obs.] Note: Synocha and synochus were used as epithets of two distinct types of fever, but in different senses at different periods. The same disease is placed under synocha by one author, under synochus by another. Quain.".

In total, how many words is it possible to make using this combination of letters?
There are 133 words available for any word that starts with 'sy' and includes 'u'.