13-Letter Words Matching B________A___

There are 13 13-letter words that match B________A___. 4 are common words, such as BILLINGSGATES and BIOCHEMICALLY. A rarer one is BRONCHOSPASMS. In this set, I is the most frequent open letter (11 words). 8 words contain a doubled letter.

Full list 13

billingsgatesbiochemicallybiodegradablebombasticallyballisticallyblackcurrantsborosilicatesbetweenbrainsbimolecularlybiosystematicbipropellantsbisectionallybronchospasms

About this list

Words
13 (4 common words)
Common example
billingsgates
Rare example
bronchospasms
Doubled letters
8
Ending in S
6
Most frequent letter
I (11)

Questions

How many 13-letter words matching b________a___ are there?

13. 4 of them are common words.

What is a common example?

BILLINGSGATES is among the common words in this set.