SORROWNESS/ES – the exclusion of this is surely an error…
REOFFENSE – the act of reoffending
WOOSE – a timid or feeble person; someone who doesn’t stand up for their principles
SOSSOS – simply look at the definition of sosses (an accepted rare word) – from ancient Greek, a group of sixty e.g. a sossos of seconds is a minute
...and...
...after viewing the solution...
...if forswornness and forswornnesses are words, why aren't FORESWORNNESS and FORESWORNNESSES??? Asking for a friend...