Rutilante, it means "shining of red" and just "shining" for extension (I guess "rutilant" is less common in English) and it is often used in a figurative sense, but you can also hironically call a friend with red hair "rutilante". Anyway I like it more to show something "burning/shining/brightly", I know it is not the real correct meaning, but I like to play with uncommon words ahah
How to pick just one? I like the word defenestration, which means the act of throwing someone out a window, because I think it is oddly specific. I also like petrichor (the smell of rain), psithurism (the sound of wind in the trees and rustling of leaves), and MANY other words. And Hippopotomonstrosesquippedaliophobia (the fear of long words), because it's so ironic
"Crepuscolo", an Italian word that has a meaning between "twilight" and "nightfall", that moment of the day just after the sunset, when the sun has already disappeared at the horizon, light is fading and the sky is full of colours... for me the best moment of the day
