Grammar Cop has cited writers in the past for using words that aren’t words. Irregardless is one, although it’s widely used and accepted (much to Grammar Cop’s dismay). Reoccur is another. Neither is a real word, but writers use irregardless and reoccur instead of regardless and recur.
Here’s another. Unthaw. The word is thaw. Unthaw isn’t a real word. If it were, it would be a synonym for freeze. Supposeably isn’t a word, either. Supposedly is.
Watch out for those pesky non-standard words. When in doubt, check a reliable dictionary.