There are 18 words that end with 'thal'.
lethal | withal | benthal |
canthal | gnathal | spathal |
unlethal | zenithal | azimuthal |
betrothal | alecithal | bismuthal |
nonlethal | sublethal | bequeathal |
semilethal | therewithal | wherewithal |
Note: These 18 words that end with 'thal' are found from the USA & Canada version of the tournament Scrabble word list.