13-Letter Words Matching __O____U_____

There are 16 13-letter words that match __O____U_____. 7 are common words, such as AMORPHOUSNESS and BRONCOBUSTERS. A rarer one is TROUBLOUSNESS. In this set, S is the most frequent open letter (16 words). 7 words contain a doubled letter.

Full list 16

amorphousnessbroncobustersgrotesquenesspromiscuitiespromiscuouslypropinquitiesprostitutionsanomalousnessgrotesqueriesisoagglutininproconsulatesanonymousnessinoperculatesproconsulshiptoothbrushingtroublousness

About this list

Words
16 (7 common words)
Common example
amorphousness
Rare example
troublousness
Doubled letters
7
Ending in S
12
Most frequent letter
S (16)

Questions

How many 13-letter words matching __o____u_____ are there?

16. 7 of them are common words.

What is a common example?

AMORPHOUSNESS is among the common words in this set.