There are 18 words that end with 'lash'.
lash | clash | flash |
plash | slash | calash |
splash | unlash | goulash |
eyelash | backlash | pearlash |
whiplash | backslash | backsplash |
multiflash | photoflash | antibacklash |
Note: These 18 words that end with 'lash' are found from the USA & Canada version of the tournament Scrabble word list.