There are 18 words that start with 'rheu'.
| rheum | rheums |
| rheumy | rheumic |
| rheumier | rheumatic |
| rheumatiz | rheumiest |
| rheumatics | rheumatism |
| rheumatoid | rheumatisms |
| rheumatizes | rheumatology |
| rheumatically | rheumatologies |
| rheumatologist | rheumatologists |
Note: These 18 words that start with 'rheu' are found from the USA & Canada version of the tournament Scrabble word list.