Prologue: This question originally appeared at Tag Housekeeping Requests. I brought it over here and gave it a separate thread of its own because that request/proposal turned out to need more discussion than I thought it would.
Deletreo means which letters appear in a word (and in what order), and ortografía covers that too, but also the use of symbols such as the accent mark, the diaerisis, and punctuation marks.
Deletreo, puntuación, uso de tildes, etc. Correct spelling, punctuation, use of accent/diacritical marks, etc.
But we also have deletreo, which is defined as
Questions about the correct way of spelling a word. Preguntas sobre la forma correcta de escribir una palabra.
Here are two examples of questions tagged deletreo:
One is also tagged with ortografía; one isn't. Is anything gained by tagging with just ortografía?
This is intended to be a polling question, with a structure for fruitful discussion.