The spelling of the word "smylie" can be a bit confusing. It is pronounced as /ˈsmaɪli/, which means the first syllable has a long 'i' sound, followed by a 'l' sound. The 'e' at the end of the word is silent, which is why it is often misspelled as "smiley". The correct spelling should have a 'ie' at the end, not a 'ey', as the 'ie' makes the long 'i' sound while the 'ey' makes a long 'e' sound. Therefore, the correct spelling of the word is "smylie".