There are 13 words that end with 'nnials'.
| biennials | decennials |
| perennials | sexennials |
| triennials | centennials |
| quadrennials | bicentennials |
| bimillennials | quinquennials |
| tercentennials | semicentennials |
| quincentennials | |
Note: These 13 words that end with 'nnials' are found from the USA & Canada version of the tournament Scrabble word list.