Chimera is a noun that refers to a fanciful fabrication or illusion.
In Greek mythology, a chimera is a fire-breathing monster that has a lion’s head, a goat’s body and a dragon’s tail. After being slain, this beast continued to live on in people’s imagination. The word later came to refer to any similarly grotesque monster. In more recent years, it refers to something fanciful.
My daughter is convinced there are horrible creatures lurking under her bed. When she talks about them, it reminds me of my younger days of being terrified of a number of similar chimeras.