14-Letter Words Matching O________O____

There are 15 14-letter words that match O________O____. 5 are common words, such as OBSTREPEROUSLY and OBSTRUCTIONISM. A rarer one is OXYHEMOGLOBINS. In this set, R is the most frequent open letter (13 words). 2 words contain a doubled letter.

Full list 15

obstreperouslyobstructionismobstructionistostentatiouslyoverdevelopingoophorectomiesorchidectomiesorganochlorineotolaryngologyosteosarcomataovercautioningovercontrolledovergenerosityovergenerouslyoxyhemoglobins

About this list

Words
15 (5 common words)
Common example
obstreperously
Rare example
oxyhemoglobins
Doubled letters
2
Ending in S
3
Most frequent letter
R (13)

Questions

How many 14-letter words matching o________o____ are there?

15. 5 of them are common words.

What is a common example?

OBSTREPEROUSLY is among the common words in this set.