There are 14 words that start with 'millen'.
| millenary | millennia |
| millennial | millennium |
| millenarian | millenaries |
| millenniums | millenarians |
| millennialism | millennialist |
| millenarianism | millennialisms |
| millennialists | millenarianisms |
Note: These 14 words that start with 'millen' are found from the USA & Canada version of the tournament Scrabble word list.