13-Letter Words Start with 'but'

There are 4 13-letter words that start with 'but'.

butterfingers	buttonhooking
butyraldehyde	butyrophenone

Note: These 4 13-letter words that start with 'but' are found from the USA & Canada version of the tournament Scrabble word list.

Also see words start with butt, buty, butc, buta, bute, butl, butu, buts.

4-letter words start with 'but' (3)
5-letter words start with 'but' (9)
6-letter words start with 'but' (12)
7-letter words start with 'but' (20)
8-letter words start with 'but' (17)
9-letter words start with 'but' (26)
10-letter words start with 'but' (28)
11-letter words start with 'but' (17)
12-letter words start with 'but' (8)
13-letter words start with 'but' (4)
14-letter words start with 'but' (4)