Hey GuitardedGeezer,
I'm thinking they all mean pretty much the same thing, I refer to a hook when writing songs though. In songwriting it's the line, or idea that really catches the ear, or summarizes what the song is about.

A lick, riff, or chop would be how I refer to a pattern of notes I put together to make up a solo.

That's my take on it, and I hope this helps you.