There are 14 words that start with 'cowp'.
| cowpat | cowpea | cowpie | 
| cowpox | cowpats | cowpeas | 
| cowpies | cowplop | cowpoke | 
| cowplops | cowpokes | cowpoxes | 
| cowpuncher | cowpunchers | |
Note: These 14 words that start with 'cowp' are found from the USA & Canada version of the tournament Scrabble word list.