As writers we often spell words one way or another. Like fairy and faerie. Like gray and grey. Both are acceptable and probably no one is going to yell at you for using either, but in my stories I have out, I’ve used both fairy and faerie. I feel like fairy is more for general conversation about the little winged mischievous people. While faerie sounds like it is more epic fantasy. I am not very consistent with this as you can tell. Look at the plural versions. Fairies looks better than faeries. Fairytale, not faerietale. Ugh, it’s frustrating. With my current series that I am writing, I have to make a final decision that from hereon in it will either remain fairy or faerie. Must find consistency. Also, I write way too many stories about fairies, it seems. lol.