There are 18 words that end with 'erve'.
nerve | serve | verve |
swerve | wherve | deserve |
innerve | observe | reserve |
unnerve | disserve | conserve |
outserve | preserve | subserve |
reobserve | unreserve | cryopreserve |
Note: These 18 words that end with 'erve' are found from the USA & Canada version of the tournament Scrabble word list.