There are 21 words that start with 'blat'.
| blat | blate | 
| blats | blatant | 
| blather | blatted | 
| blatter | blatancy | 
| blathers | blatters | 
| blatting | blatantly | 
| blathered | blatherer | 
| blattered | blatancies | 
| blatherers | blathering | 
| blattering | blatherskite | 
| blatherskites | |
Note: These 21 words that start with 'blat' are found from the USA & Canada version of the tournament Scrabble word list.