15-Letter Words Matching O_______O______

There are 13 15-letter words that match O_______O______. 2 are common words, such as OPHTHALMOLOGIES and OPHTHALMOLOGIST. A rarer one is OVERZEALOUSNESS. In this set, E is the most frequent open letter (11 words). 3 words contain a doubled letter.

Full list 13

ophthalmologiesophthalmologistodoriferousnessophthalmoscopesorganophosphateophthalmoscopicopprobriousnessoverdiscountingoverelaboratingoverelaborationoverglamorizingoverproportionsoverzealousness

About this list

Words
13 (2 common words)
Common example
ophthalmologies
Rare example
overzealousness
Doubled letters
3
Ending in S
6
Most frequent letter
E (11)

Questions

How many 15-letter words matching o_______o______ are there?

13. 2 of them are common words.

What is a common example?

OPHTHALMOLOGIES is among the common words in this set.