14-Letter Words Matching O___O_________

There are 21 14-letter words that match O___O_________. 2 are common words, such as OSTEOARTHRITIS and OVEROPTIMISTIC. A rarer one is OXYMORONICALLY. In this set, R is the most frequent open letter (18 words). 4 words contain a doubled letter.

Full list 21

osteoarthritisoveroptimisticoophorectomiesorthochromaticorthographicalorthopedicallyosteoarthriticoligopsonisticonchocerciasesonchocerciasisorthogonalizedorthogonalizesorthomolecularorthophosphateosteosarcomataoutgoingnessesoutpolitickingoverorganizingoverornamentedoxidoreductaseoxymoronically

About this list

Words
21 (2 common words)
Common example
osteoarthritis
Rare example
oxymoronically
Doubled letters
4
Ending in S
6
Most frequent letter
R (18)

Questions

How many 14-letter words matching o___o_________ are there?

21. 2 of them are common words.

What is a common example?

OSTEOARTHRITIS is among the common words in this set.