Spelling mistake
From Teflpedia
A spelling mistake (/ˈspelɪŋ(g) məsˈteɪk/) is an error or mistake made with spelling.
For example, spelling "separate" as *"seperate".[1]
English speakers, both native speakers and non-native speakers, frequently make spelling mistakes largely due to irregular spelling.
Those with dyslexia tend to make more mistakes.
Teachers also sometimes make spelling mistakes.