A person who hoards things.(Accumulate (money or valued objects) and hide or store away.)
As continues to be typical of on line dictionaries, we were left with merely the “person who hoards things” phrase as its entire definition, expecting intrepid word explorers to determine the root verb (which has been added above for your convenience in parentheses). In our digital age, the extra effort really should belong to the dictionary. Then again, maybe the lexicographers were having a bit of fun, hoarding the underlying definition, as it were.