13-Letter Words Matching B_T__________

There are 13 13-letter words that match B_T__________. 2 are common words, such as BATTLEGROUNDS and BUTTERFINGERS. A rarer one is BUTYROPHENONE. In this set, E is the most frequent open letter (12 words). 10 words contain a doubled letter.

Full list 13

battlegroundsbutterfingersbetweenwhilesbutyraldehydebathymetricalbetweenbrainsbetweennessesbitterbrushesbittersweetlybottlebrushesbottleneckingbuttonhookingbutyrophenone

About this list

Words
13 (2 common words)
Common example
battlegrounds
Rare example
butyrophenone
Doubled letters
10
Ending in S
7
Most frequent letter
E (12)

Questions

How many 13-letter words matching b_t__________ are there?

13. 2 of them are common words.

What is a common example?

BATTLEGROUNDS is among the common words in this set.