What is the most common term for writing errors related to incorrect spelling of words?

The term that most accurately refers to writing errors stemming specifically from the incorrect spelling of words is "misspellings." This term directly addresses the action of spelling a word incorrectly, highlighting the mistake in the word's form.

While "typos" refers to typographical errors that can include misspellings, it primarily encompasses mistakes made while typing, which may not always pertain strictly to spelling but could also involve other types of errors, such as misplaced letters or omissions. The term "errors" is very broad and could refer to a variety of mistakes in writing, not limited to spelling. The phrase "correctness issues" is also vague, as it does not specifically pinpoint misspellings and could refer to any number of inaccuracies in writing, from grammar to punctuation.

Therefore, "misspellings" is the most specific and commonly used term to describe writing errors specifically related to incorrect word spellings.