13-Letter Words Matching O_O__________

There are 15 13-letter words that match O_O__________. 2 are common words, such as ONOMATOPOEIAS and ONOMATOPOETIC. A rarer one is OTOTOXICITIES. In this set, I is the most frequent open letter (12 words). 3 words contain a doubled letter.

Full list 15

onomatopoeiasonomatopoeticodontologicalodoriferouslyovoviviparityovoviviparousodontoblasticodontoglossumodorousnessesonomasticallyonomasticiansonomatologiesonomatologistoropharyngealototoxicities

About this list

Words
15 (2 common words)
Common example
onomatopoeias
Rare example
ototoxicities
Doubled letters
3
Ending in S
6
Most frequent letter
I (12)

Questions

How many 13-letter words matching o_o__________ are there?

15. 2 of them are common words.

What is a common example?

ONOMATOPOEIAS is among the common words in this set.