There are 3 15-letter words that start with 'ru'.
| rudimentariness | rumbustiousness |
| rumormongerings | |
Note: These 3 15-letter words that start with 'ru' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with rub, rum, rus, run, rud, rug, rut, ruf, ruc, rur, rui, rul, rue, rup, rua.
3-letter words start with 'ru' (6)