NOVA REAP OVEN LOAN
4853 3481 7516
I've found with my three DCs that a visual method helps, write out the numbers in a grid,
Looking down the grid you can often spot patterns, the same number in the same column, this one is harder. Other patterns include a number in multiple codes but in different positions, or double numbers = double letters, etc.
Next up look for a pair in two codes, first and last moves to another two positions, etc.
I spotted 48 at position 1st and 2nd and then 2nd and 3rd, matching to the words.
. OV .
The rest then falls into place. This looks like one of the harder (but not hardest!) type of this question, I think the amount of information can be overwhelming so writing out a grid makes a start on solving the problem and builds confidence.