The words in the crossword are represented by numbers. each number stands for a different letter of the alpha?

Question

put the letter into all squares containing that number . use the charts on the left and right to keep track of the ones youve decoded. the letter with number here is number 16 R and 6 is O.

Answer 1

And what do you need to know?

Answer 2

I don't know the exact term for this type of puzzle where a number represents an alphabet throughout the puzzle. Could it be a 'cryptogram' which is a general term?