This is the 13470th most frequent Russian word.
наполнить
"Наполнить" means "to fill" or "to fill up."
Here, 'наполнить' is used to describe the physical action of filling a container with a substance.
Они решили наполнить чашу водой.
They decided to fill the bowl with water.
In this case, 'наполнить' is metaphorically used to express the action of evoking an emotion or feeling.
Его слова наполнили меня радостью.
His words filled me with joy.
Here, 'наполнить' describes the action of spreading or suffusing an area with light.