13-Letter Words Matching B_________T__

There are 13 13-letter words that match B_________T__. 4 are common words, such as BELLIGERENTLY and BILLINGSGATES. A rarer one is BRAILLEWRITER. In this set, E is the most frequent open letter (13 words). 7 words contain a doubled letter.

Full list 13

belligerentlybillingsgatesblabbermouthsbrokenheartedbehavioristicblatherskitesborosilicatesbachelorettesbacteriolyticbimetallisticbiosystematicbittersweetlybraillewriter

About this list

Words
13 (4 common words)
Common example
belligerently
Rare example
braillewriter
Doubled letters
7
Ending in S
5
Most frequent letter
E (13)

Questions

How many 13-letter words matching b_________t__ are there?

13. 4 of them are common words.

What is a common example?

BELLIGERENTLY is among the common words in this set.