The term 'Fully Filled' can be expressed in two different ways in a crossword puzzle. The first is 'SATED' which is a 5 letter word meaning to be filled to satisfaction or contentment. The second is 'SATIATED' which is an 8 letter word meaning to be filled to the point of surfeit or excess. Both words imply that something has been filled to its capacity, but SATED implies a more moderate level of filling than SATIATED.