There are 17 words that start with 'mamma'.
| mamma | mammae | mammal | 
| mammas | mammals | mammary | 
| mammate | mammati | mammatus | 
| mammalian | mammality | mammalogy | 
| mammalians | mammalities | mammalogies | 
| mammalogist | mammalogists | |
Note: These 17 words that start with 'mamma' are found from the USA & Canada version of the tournament Scrabble word list.