Germophobe vs. Germaphobe

Today, instead of talking about germs, I'm giving a brief spelling lesson :-). I recently became aware that there are significantly more people searching for the word "germaphobe" than "germophobe." It made me question how it is really spelled. So, I went to Merriam-Webster for the answer. It turns out I was right. It is spelled "germOphobe." What a relief. I don't have to change the title of my book.