15-Letter Words Matching ___O__O________

There are 26 15-letter words that match ___O__O________. 9 are common words, such as ACCOMMODATINGLY and ATROCIOUSNESSES. A rarer one is RUMORMONGERINGS. In this set, I is the most frequent open letter (23 words). 12 words contain a doubled letter.

Full list 26

Common words

accommodatinglyatrociousnessesautobiographersautobiographiesferociousnessesinnocuousnesseslaboriousnessesmelodiousnessesobnoxiousnesseserroneousnesseshypochondriacalhypochondriases
accommodatinglyatrociousnessesautobiographersautobiographiesferociousnessesinnocuousnesseslaboriousnessesmelodiousnessesobnoxiousnesseserroneousnesseshypochondriacalhypochondriaseshypochondriasisinconsolabilitythromboembolismthromboplastinsaccommodationalautotrophicallycryoprotectantscytophotometricdecomposabilityfeloniousnesseshemoglobinuriasmonopropellantsreconsolidatingrumormongerings

About this list

Words
26 (9 common words)
Common example
accommodatingly
Rare example
rumormongerings
Doubled letters
12
Ending in S
17
Most frequent letter
I (23)

Questions

How many 15-letter words matching ___o__o________ are there?

26. 9 of them are common words.

What is a common example?

ACCOMMODATINGLY is among the common words in this set.