There are 18 words that start with 'rui'.
| ruin | ruing |
| ruins | ruined |
| ruiner | ruinate |
| ruiners | ruining |
| ruinous | ruinable |
| ruinated | ruinates |
| ruinating | ruination |
| ruinously | ruinations |
| ruinousness | ruinousnesses |
Note: These 18 words that start with 'rui' are found from the USA & Canada version of the tournament Scrabble word list.