There are 20 words that start with 'tree'.
| tree | treed | treen |
| trees | treens | treeing |
| treetop | treelawn | treeless |
| treelike | treenail | treetops |
| treehouse | treelawns | treenails |
| treenware | treehopper | treehouses |
| treenwares | treehoppers | |
Note: These 20 words that start with 'tree' are found from the USA & Canada version of the tournament Scrabble word list.