There are 15 words that start with 'urina'.
| urinal | urinals | urinary | 
| urinate | urinated | urinates | 
| urinator | urinaries | urinating | 
| urination | urinative | urinators | 
| urinalyses | urinalysis | urinations | 
Note: These 15 words that start with 'urina' are found from the USA & Canada version of the tournament Scrabble word list.