It can be confusing whether to spell a Latin word with -ian or -ion but there is a rule to help. The rule says that you spell โian at the end of the word if it is someone who does something โ e.g., a magician does magic โ but it is -ion if the word does not do something, like โstationโ or “nation”, they mean something but they are not people who do things like magician, electrician, physician, tactician. Watch the 3m video clip below – it shows how to teach -ian.*
If you would like some more spelling hints, there is the new edition of New Zealand dyslexia handbook (NZCER Press, 2023).