12-Letter Words Matching ________OO__

There are 19 12-letter words that match ________OO__. 2 are common words, such as BROTHERHOODS and BULLETPROOFS. A rarer one is WIDOWERHOODS. In this set, S is the most frequent open letter (18 words). 19 words contain a doubled letter.

Full list 19

brotherhoodsbulletproofscrinklerootsleatherwoodslollapaloosalollapaloozasnaggletoothvinegarroonswithoutdoorsbumbershootsgreaseproofsinterschoolsprophethoodsscattergoodsservanthoodsshittimwoodssuperschoolstoddlerhoodswidowerhoods

About this list

Words
19 (2 common words)
Common example
brotherhoods
Rare example
widowerhoods
Doubled letters
19
Ending in S
16
Most frequent letter
S (18)

Questions

How many 12-letter words matching ________oo__ are there?

19. 2 of them are common words.

What is a common example?

BROTHERHOODS is among the common words in this set.