Is a "misspelled" word which subsequently creates another word still considered misspelled? [closed]
The word you're looking for is "typo".
In your example, word isn't necessarily a misspelling. It could be that the author thinks word means world (a mistake, but not a misspelling), or is in fact saying something other than what you expected, and intended to type word. However, if he intended world and typed word, it's a misspelling: nowhere in the definition is there a phrase 'except where this creates a valid word in English'.