12-Letter Words Matching ______O___U_

There are 12 12-letter words that match ______O___U_. 6 are common words, such as HIPPOPOTAMUS and INCOMMODIOUS. A rarer one is UNCENSORIOUS. In this set, S is the most frequent open letter (11 words). 4 words contain a doubled letter.

Full list 12

hippopotamusincommodiousinharmoniousparsimoniousteaspoonsfulvaingloriousamphicoelouscarillonneurelectrotonushectocotylusnielsbohriumuncensorious

About this list

Words
12 (6 common words)
Common example
hippopotamus
Rare example
uncensorious
Doubled letters
4
Ending in S
9
Most frequent letter
S (11)

Questions

How many 12-letter words matching ______o___u_ are there?

12. 6 of them are common words.

What is a common example?

HIPPOPOTAMUS is among the common words in this set.