There are 13 10-letter words that start with 'bir'.
| biradicals | birdbrains | birddogged |
| birdhouses | birdliming | birthmarks |
| birthnames | birthplace | birthrates |
| birthright | birthroots | birthstone |
| birthworts | ||
Note: These 13 10-letter words that start with 'bir' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with bird, birt, birl, bira, bire, birr, birc, birk, biri, biro, birs, biry.
4-letter words start with 'bir' (5)