Any language, explain what it means if it’s not English.
For example (as a non-native speaker) I’ve always liked the English word ‘unprecedented’, mostly in the context of fiction. Especially if it paints some entity to be really mystical or wondrous or it’s own never before seen order of magnitude in any way.
I have a few favorite ones in english (which is not my first language) of the top of my head:
-Document/documented (I particularly like the Q sound of the second syllable and the cadence of the pronunciation)
-Cocoon. (Just great. Satisfying to say. Makes me feel cosy. 10’s across the board)
-Gazebo. (Very removed from the usual sounds of my native language, unusual but fun)
Edited to add:
In spanish: Panóptico (panopticon) also satisfying to sat and with good cadence