There are 16 words that start with 'cobb'.
| cobb | cobbs | cobby | 
| cobber | cobble | cobbers | 
| cobbier | cobbled | cobbler | 
| cobbles | cobbiest | cobblers | 
| cobbling | cobblestone | cobblestoned | 
| cobblestones | ||
Note: These 16 words that start with 'cobb' are found from the USA & Canada version of the tournament Scrabble word list.