

As in put into regular use and understood in all the various ways they may come to be understood. As compared to a word that one makes up in private that only they understand and may never pass from them into use by anyone else, particularly with their personal understanding/meaning.
However this is meant as a fun question, so you may answer with your ideal conditions in mind. The question is meant to provide a starting point, not set any strict bounds or punitive conditions.
Perhaps malleerphobia? Or if being formal-ish, anaspectaphobia?