Runewords and Glyphwords are special protective words that can be enchanted onto weapons/armour – later in the game – and are part of the Hearts of Stone DLC.
Runestones are the circular magic stones that you fit into the sockets on your weapons to boost their effectiveness. Glyphs are the magic stone tablets that fit into your armour, and are used to boost your Witcher Sign effectiveness.
The Wild Hunt chase Geralt and Yennefer as they ride to Vizima. This happens just after leaving White Orchard.