There are 18 words that end with 'wash'.
wash | awash | swash |
rewash | carwash | hogwash |
eyewash | outwash | prewash |
backwash | downwash | flatwash |
rainwash | brainwash | greenwash |
mouthwash | stonewash | whitewash |
Note: These 18 words that end with 'wash' are found from the USA & Canada version of the tournament Scrabble word list.