There are 17 words that start with 'roof'.
| roof | roofs | roofed | 
| roofer | roofie | roofers | 
| roofies | roofing | rooftop | 
| roofings | roofless | rooflike | 
| roofline | rooftops | rooftree | 
| rooflines | rooftrees | |
Note: These 17 words that start with 'roof' are found from the USA & Canada version of the tournament Scrabble word list.