There are 11 words that start with 'robu'.
| robust | robusta |
| robustas | robuster |
| robustly | robustest |
| robustious | robustness |
| robustiously | robustnesses |
| robustiousness | |
Note: These 11 words that start with 'robu' are found from the USA & Canada version of the tournament Scrabble word list.