-opsis /-op-sis/

1. Denoting appearance of, or resemblance to, the thing specified, as in meconopsis
2. Sight, as in stereopsis

• ill-used
• ill-uses
• ill-using
• illusion
• illusional
• illusionary
• illusionism
• illusionisms
• illusionist
• illusionistic
• illusionists
• illusions
• illusive
• illusively
• illusiveness
• illusivenesses
• illusorily
• illusoriness
• illusory
• illustrate
• illustrated
• illustrateds
• illustrates
• illustrating
• illustration