There are 13 words that start with 'illusi'.
| illusion | illusive |
| illusions | illusional |
| illusively | illusionary |
| illusionism | illusionist |
| illusionisms | illusionists |
| illusiveness | illusionistic |
| illusivenesses | |
Note: These 13 words that start with 'illusi' are found from the USA & Canada version of the tournament Scrabble word list.