This is a good quiz but consider the following: accept cthulu for Cthulhu, accept Mourning Wood without the "s" change from Pumking to "Pumpking", because you spelled it wrong, and technically the Headless horseman isn't a boss. Other than that, Great Quiz!
i know you probably don’t check these, but here’s one you missed, during the easter event, there is a boss called Lepus, he is that large rabbit that multiplies and shoots out large and small eggs to spawn more of him or his lackeys
Dungeon Guardian and Headless Horseman aren't bosses, You spelled "Pumpking" as Pumking", and you only have "The" on some answers, but not on others. like it's The Eater of Worlds, The Wall of Flesh, The Eye of Cthulhu, etc., use them all, or use none of them.