raving, raven

Raving or raving is a participle ( used with a helper verb ) of "rave", meaning to talk wildly, as if mad or delirious--
He is raving; don't pay any attention to him.
The man raving at the sign on the corner may need some help.

Raving may also mean talking or writing with great enthusiasm--
They are raving about the new movie, but I didn't like it.

Raving is also an old-fashioned slang term meaning extraordinary or remarkable--
She was a raving beauty back in the day.

Raven or raven means the black bird that is similar to a crow--
"In there stepped a stately Raven of the saintly days of yore."
Is that crow or a raven?

Raven ( sometimes spelled ravin ) also means to seek plunder or prey, literally or figuratively, or to eat voraciously, like an animal--
They were so hungry they were tempted to raven through the forest for something to eat.
Sit up and eat nicely; don't raven like a wild beast!

Now that you know that, you can say--
"He is raving about literature, and quoting an old poem about a raven."