The letter X, such an elusive little thing. I feel like it's the most underused letter in the alphabet or at least in my vocabulary it certainly is. A lot of the words that start with X are words I've never really heard of before. Except for the more basic ones like 'Xylophone' and honestly, I've never used one before other than the little rainbow one as a child so I can't personally speak on it.
There's not much I can say on the matter really so, have a good day!