There are 21 words that start with 'rous'.
rouse | roust | roused |
rouser | rouses | rousts |
rousers | rousing | rousted |
rouster | rousseau | rousters |
rousting | rousement | rousingly |
rousseaus | rouseabout | rousements |
roustabout | rouseabouts | roustabouts |
Note: These 21 words that start with 'rous' are found from the USA & Canada version of the tournament Scrabble word list.