There are 14 12-letter words that start with 'wate'.
| watercoolers | watercourses | watercresses |
| waterflooded | waterfowlers | waterfowling |
| waterinesses | waterishness | waterlogging |
| watermanship | watermarking | waterproofed |
| waterproofer | waterskiings | |
Note: These 14 12-letter words that start with 'wate' are found from the USA & Canada version of the tournament Scrabble word list.