15-Letter Words Matching __O___R________

There are 14 15-letter words that match __O___R________. 2 are common words, such as BROTHERLINESSES and FOOLHARDINESSES. A rarer one is STOCKBROKERAGES. In this set, I is the most frequent open letter (13 words). 6 words contain a doubled letter.

Full list 14

brotherlinessesfoolhardinessesbioastronauticsinopportunenessphototransistorbiodegradationsexothermicitiesgeohydrologistsgeometrizationsphonogramicallyphotogrammetricphotoproductionphototropicallystockbrokerages

About this list

Words
14 (2 common words)
Common example
brotherlinesses
Rare example
stockbrokerages
Doubled letters
6
Ending in S
9
Most frequent letter
I (13)

Questions

How many 15-letter words matching __o___r________ are there?

14. 2 of them are common words.

What is a common example?

BROTHERLINESSES is among the common words in this set.