orthographical

/ˌɔrθəˈɡræfɪkəl/
adjective
  1. Relating to spelling or the system of writing a language.
    • The dictionary includes orthographical notes for tricky words.
    • Learning orthographical conventions helps you write more clearly.
    • The orthographical differences between British and American English include 'colour' vs. 'color.'
Synonyms
What does "orthographical" mean? | whatsthatwordmean | whatsthatwordmean