The google chrome browser has a built in spell checker. When you are filling in a form and type a word that chrome does not recognize, it will underline it with a red squiggly line. Listed here are a number of words I have found that chrome does not recognize, but are in fact real words and curiously are even recognized by the google search engine. I have not done any research or datamining for this, I've just written the words down as I encounter them through normal usage.
Perhaps a poem could be written using only these words.