13-Letter Words Matching O__O_________

There are 17 13-letter words that match O__O_________. 7 are common words, such as OBNOXIOUSNESS and OBSOLESCENCES. A rarer one is OUTORGANIZING. In this set, N is the most frequent open letter (15 words). 11 words contain a doubled letter.

Full list 17

obnoxiousnessobsolescencesoctogenariansoleomargarineoleomargarinsopportunisticopportunitiesobsolescentlyoctodecillionoctosyllablesontogenicallyontologicallyopportunenessoctosyllabicsongoingnessesoppositionistoutorganizing

About this list

Words
17 (7 common words)
Common example
obnoxiousness
Rare example
outorganizing
Doubled letters
11
Ending in S
9
Most frequent letter
N (15)

Questions

How many 13-letter words matching o__o_________ are there?

17. 7 of them are common words.

What is a common example?

OBNOXIOUSNESS is among the common words in this set.