first time posting anything, I hope this belongs here... if not, apologies I was wondering if someone could help me with this problem: I'm frequently struggling with how to appropriately name things in my worlds. I tend to create worlds with lots and lots of detail, sometimes even complete fictional languages so coming up with a name for something is not the problem. It's more like I'm unsure about when to use a fictional name of my own or borrow a real-world term. For example: one of my MCs carries a blade that can best be described as a stiletto. Now I understand a stiletto is a 16th century blade with italian origin but my story is set in a fantasy world that's losely based on ancient egypt culture. Would it be inappropriate to call the thing a stiletto? Should I describe around it or rather come up with a name of my own? Same goes for the use of certain scientific terms. The latin and greek languages don't exist in this world so if I'm writing a scholar character, would it be lazy or inappropriate if they used, say, the latin naming system for animals? What do you think about that?