There are 14 words that start with 'cowb'.
| cowboy | cowbane | cowbell | 
| cowbind | cowbird | cowboys | 
| cowbanes | cowbells | cowberry | 
| cowbinds | cowbirds | cowboyed | 
| cowboying | cowberries | |
Note: These 14 words that start with 'cowb' are found from the USA & Canada version of the tournament Scrabble word list.