There are 13 10-letter words that start with 'bat'.
| batfowlers | batfowling | bathhouses | 
| batholiths | bathwaters | bathymetry | 
| bathyscaph | batrachian | battailous | 
| battalions | battements | battlement | 
| battleship | ||
Note: These 13 10-letter words that start with 'bat' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with batt, bath, batf, bati, batc, bate, bats, batb, batg, batm, bato, batr, batl, batw.
4-letter words start with 'bat' (4)