I've read all the replies and here is what I think, for what it's worth.
First, it is not a Blunt used to knock down animals without killing them. Like Gator said, that is a misconception of Hafted Scrapers. The old timers called them Blunts and that where that's notion came from.
Second, from the looks of the picture it looks to be to thin to have been a Hoe. These type Tools were always very sturdy so the they could be used with lots of pressure to break open the soil so it could be planted. A thin Blade such as this would snap very quickly with any type of pressure applied to it.
It could be a large Hafted Scraper. That is one possibility. The other is like rock mentioned and it is a reworked Knife that had the tip broken off if it.
Is there any grinding along the upper edges of the base on both sides? It has the basal shape of a Paleo piece and I did actually see a Clovis found once that had been reworked into a Hafted Scraper. First time we took a guy hunting and the lucky SOB finds a Clovis Hafted Scraper. Fluted on both sides and highly ground. lol