13-Letter Words Matching __OU_________

There are 12 13-letter words that match __OU_________. 5 are common words, such as GROUCHINESSES and THOUGHTLESSLY. A rarer one is TROUBLOUSNESS. In this set, E is the most frequent open letter (11 words). 7 words contain a doubled letter.

Full list 12

grouchinessesthoughtlesslytroublemakerstroubleshootstroublesomelygroundskeepertroublemakingcloudlessnessflourishinglygroundbreakerslouchinessestroublousness

About this list

Words
12 (5 common words)
Common example
grouchinesses
Rare example
troublousness
Doubled letters
7
Ending in S
6
Most frequent letter
E (11)

Questions

How many 13-letter words matching __ou_________ are there?

12. 5 of them are common words.

What is a common example?

GROUCHINESSES is among the common words in this set.