RE: wisteria （藤）
I started reading demon slayer, and it comes up a lot, because it is used to keep demons away 
Brings back FFXI memories.
“Canope” and “to hock” are the latest for me.
Edit: I guess I didn’t really learn it since it’s “canopy”.
Superfluous! It means unnecessary.
To foster, as a non native you don’t here that a lot
Yonder. Seeing it in the wild, would dismiss it like something out of Christmas carols. Will struggle to add it to active vocab for sure.
This. I only knew cleat as a marine term, and it actually made it worse to use as a mnemonic. I also hate sportsball, so it didn’t help much. x)
Geodick… eh, I mean duck, geoduck.
Ok maybe it’s more a creature name than an English word so um, yurt.
“A yurt is a portable, circular dwelling made of a lattice of flexible poles and covered in felt or other fabric. They are a sturdy, reliable type of tent.”
In my native language we don’t categorize it, we call all type of tent as same thing; tenda.
Firmament for 大空: Heavens, Firmament, Sky, Skies
If I’ve met this word in the wild, I would’ve guessed it has to do something with “firm” as hard/strong foundation maybe. Close enough “In biblical cosmology, the firmament is the vast solid dome created by God on the second day.” (wikipedia)
Yurt. I only knew it as “ger” (Mongolian) when it was featured on a Korean variety show.
brandish. I don’t have any idea what it was. I thought it was just a slang of word brand 
This is often used in a fantasy setting in fiction/books, especially for swords/weapons. Brandishing a weapon, for example. Heres a sentence I found online: “I could see that he was brandishing a knife”
Wisteria. Not even got the faintest idea what they are called in my own language. Not even sure I have ever come across one and thought, “oh boy, I so need to know what they are called.”
Could have lived without that kanji tbh XD
But maybe not. 藤 is surprisingly useful !
Sometimes it’s nice just to learn about things that are beautiful though, right? 
Yurt, cleat, canopy, toil and geoduck are the ones I can remember now, but I’m sure I have learned at least a couple more.
Goeduck, wish I could forget it know.
Skosh, I thought this was an English word, now know its actually Japanese.
Nietzsche, I had no idea who this was, so I guess I’m learning history too.
Ford. What do you mean it’s not just a car brand?
Hollyhock!
To me, it seems that the ‘proper’ origin of a nailbat is the trench clubs used in trench raids in WW1. These weapons were self-made by the soldiers and usually consisted of a wooden club with metal objects (such as nails) fixed to it to increase effectiveness.
Many of them actually look like baseball bats, but are shorter in general. For example, take a look at this.
The commercial wooden baseball bats date back to the late 19th century, and even though baseball was a new sport in Europe (I can’t imagine US soldiers bringing baseball bats to a war) in the beginning of the 20th century, it is entirely possible some trench clubs were actually made of baseball bats with nails attached to them. However, I could not find a reference for that to support my theory.
In Encyclopedia of Military Technology and Innovation it is said that “a common design was shaped like a wooden baseball bat” but that’s the closest I could get.
So, the mystery still remains: Who and where was the first to come up with the idea of a nailbat? My bet is on the WW1 trench club theory.
As said, this is my theory with no official sources to support it but at the very least, it is safe to say the nailbat was inspired by the trench clubs.