Enneagons are nine-sided polygons, and some people prefer to call them “nonagons.” I try not to use the latter term because it mixes Greek and Latin word-parts, which the former term, derived purely from Greek, does not do.
This was made using Stella 4d, a program you may try for yourself here.
RobertLovesPi.net 
OK, I will have to look up enneagons. I have heard of nonagons. Sorry!
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They’re synonyms. “Nonagon” is more commonly used, but “enneagon” is more linguistically consistent with other polygon-names.
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