I find the spellcheckers included with most software to be woefully inadequate.
Many common words are not included in your typical spellchecker.
For example, try spellchecking these common words:
Most spellcheckers will claim that a majority of those common words are erroneous.
Is there an open data source of words commonly missing from spellcheckers?
Note that I'm not looking for a massive list with every corporation and product name. I'm looking for a simple list of words similar to the above five examples. I don't know how many common words are missing from most spellcheckers, but I would imagine a list of about 50-500 words will be adequate.