Answer: orthography

AnswerCrossword Clue
ORTHOGRAPHYCorrect spelling.
orthographyThe conventional spelling system of a language
orthographyThe study of spelling and how letters combine to represent sounds and form words
orthographythe art of writing words with the proper letters, according to accepted usage; correct spelling.
orthographythe branch of knowledge concerned with the study of spelling and representing sounds of a language by letters and diacritics