There are 15 words that start with 'pier'.
| pier | piers | pierce | 
| pierced | piercer | pierces | 
| pierogi | pierrot | piercers | 
| piercing | pierrots | piercings | 
| pieridine | pierogies | piercingly | 
Note: These 15 words that start with 'pier' are found from the USA & Canada version of the tournament Scrabble word list.