What's the Difference Between a Hook and a Riff?

The riff is a short and catchy melodic idea and it recurs so often that it gives character and structure to a song. The hook is any part of a song that is meant to grab the listener's attention. The hook is also catchy but it doesn't recur as often so that it makes a greater impact when it turns up.

What Is a Hook in a Song and How to Write One

What Is a Riff?

What is the difference between a vocal run and vocal riff? - Quora

What's the difference between melisma and runs/riffs? - Quora

What's the difference between a riff, melody, and hook? - General Discussion - Elektronauts

Do other instruments have the equivalent of a guitar riff? - Quora

What is the difference between an ostinato and a riff in music

What makes a good guitar riff? - BBC Bitesize

Is the riff on Through the Fire and the Flames the fastest metal