ultracrepidarian

One who speaks above his level of knowledge, experience or expertise. From Latin Ultra=above & beyond + crepis-idis=sole,keel.

lucubrate

To write in a scholarly fashion; produce scholarship.
[Latin lucubrbre, l昱ubrat-, to work at night by lamplight.]

seigniorage

Revenue or a profit taken from the minting of coins, usually the difference between the value of the bullion used and the face value of the coin.