There are 12 words that start with 'mosa'.
| mosaic | mosaics | mosasaur |
| mosaicism | mosaicist | mosaicked |
| mosasaurs | mosaically | mosaicisms |
| mosaicists | mosaicking | mosaiclike |
Note: These 12 words that start with 'mosa' are found from the USA & Canada version of the tournament Scrabble word list.