12-Letter Words Matching B_______O___

There are 20 12-letter words that match B_______O___. 7 are common words, such as BATTLEFRONTS and BATTLEGROUND. A rarer one is BUTTONHOOKED. 15 words contain a doubled letter.

Full list 20

battlefrontsbattlegroundblabbermouthbreakthroughbrotherhoodsbulletproofsbutterscotchbastinadoingbellbottomedbladdernosesbladderwortsbreechblocksbreechclothsbrushstrokesbarricadoingbifunctionalblastosporesbreechcloutsbumbershootsbuttonhooked

About this list

Words
20 (7 common words)
Common example
battlefronts
Rare example
buttonhooked
Doubled letters
15
Ending in S
11

Questions

How many 12-letter words matching b_______o___ are there?

20. 7 of them are common words.

What is a common example?

BATTLEFRONTS is among the common words in this set.