llover
/ʝoˈbeɾ/ · B1 · verb
to rain
☔ From Latin pluere, to rain, the same root as English pluvial
Latin pl- turned into Spanish ll-: pluvia became lluvia (rain), plenus became lleno (full), plorare became llorar (to cry). So llover is pluere with that same ll- swap, and it sits right next to lluvia.