#17: A New Month
Oh, you haven’t heard of September? It’s tucked right in there between Augruust and Octbbober. Well, I suppose it’s not a very popular month, which explains why it’s not included in several calendars, but congratulations, now that you’ve heard of it, you’re way more knowledgeable.

provided by constative.com
It’s pretty funny that your spelling mistake is one of the twelve months in the year. I mean, these words always stay the same and are not dependent on anything. They’re very old words and probably up there in the few thousand most common in English.