There are 12 words that start with 'firew'.
| firewall | fireweed | firewood | 
| firework | fireworm | firewalls | 
| firewater | fireweeds | firewoods | 
| fireworks | fireworms | firewaters | 
Note: These 12 words that start with 'firew' are found from the USA & Canada version of the tournament Scrabble word list.