Fireflies or lightning bugs?

On the way home last night, we drove past several fields all aglow with fireflies. Or lightning bugs. Whatever you want to call them. The conversation went a little like this:

Me: "Look at all the lightning bugs in the fields!"
Liberty: "Oh, there's fireflies too!"
Me: "Fireflies are lightning bugs. Same thing, different name."
Liberty: "Do lightning bugs bite?"
Me: "No. We've talked about this before."
Liberty: "We did? I thought we were talking about fireflies."
Me: "Honey, fireflies ARE lightning bugs. Same bug. Different name."
Liberty: "Oh, so fireflies and lightning bugs must be friends!"
Me: "Oh boy. Liberty. They are the same. It's like a nickname. It's like calling it a couch and a
sofa. A cup and a glass. Same thing. Two names."
Liberty: "Oh, so lightning bugs ARE fireflies?"
Me: "That's what I've been trying to tell you!"