Words that start with 'sus' and contain 'f'

In total, how many words can one make using this combination of letters?
It is possible to derive 5 words using the specified combination.

How many letters does the longest word on this page contain?
'Suspensefulness'

Which word from this list is the most unusual?
The most peculiar word in this list is 'suspectful'. The typical definition of 'suspectful' is as follows: "Apt to suspect or mistrust; full of suspicion; suspicious; as, to be suspectful of the motives of others. Milton. -- Sus*pect"ful*ness, n.". Source Cambridge Dictionary.