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.