13-Letter Words Matching B_________O__

There are 13 13-letter words that match B_________O__. 3 are common words, such as BACHELORHOODS and BIOTECHNOLOGY. A rarer one is BUTYROPHENONE. In this set, A is the most frequent open letter (11 words). 2 words contain a doubled letter.

Full list 13

bachelorhoodsbiotechnologyburglarproofsbalsamiferousbignoniaceousboraginaceousbrachypterousbaroreceptorsbasificationsbenzimidazolebibliolatrousblastulationsbutyrophenone

About this list

Words
13 (3 common words)
Common example
bachelorhoods
Rare example
butyrophenone
Doubled letters
2
Ending in S
10
Most frequent letter
A (11)

Questions

How many 13-letter words matching b_________o__ are there?

13. 3 of them are common words.

What is a common example?

BACHELORHOODS is among the common words in this set.