Investing in _anything_ productive is the opposite of hoarding. Hardly anyone in an advanced economy hoards large amounts of physical paper money; banks keep it to satisfy customer demand, but would much rather have the money in their central bank deposit account. A couple of central banks in Europe are experimenting with tiny negative rates on these deposit accounts precisely to encourage them to lend it out.

If you _invest_, you're either buying a productive asset, or storing something valuable for a period of time, or giving money to some other business to spend on equipment, employees etc. in the hope of future return.