When I first entered the workforce, I asked an older, wiser friend to review my resume. She chastised me for using the word telephony, laughing at my “made-up word.” Even though I used it correctly and my prospective employers would (likely) understand it, my friend’s mirth and Master’s degree intimidated me, so I removed telephony from my resume.
Recently I learned a word I really want to use: theocrasy. This would fit nicely in a book I’m working on, but I fear readers will misread it or think I made a typo and meant theocracy, which conveys a different idea. (It doesn’t help that both words are pronounced the same.)
My conclusion is that being right doesn’t matter if people misunderstand what you’re saying.