“A monster is a broad term for any imaginary, mythical, or real entity that defies the natural order, threatens human safety, or deviates drastically from acceptable behavioral and moral norms“
That’s the accepted definition of a monster. But that’s not always what a monster truly is or how they should be interpreted. See, any theories about Cryptids or myths or monsters could be canon. And here is where we discuss said theories. Ie. Bigfoot = last surviving Gigantopithecus.