He is a fast/slow 'walker'. [=he walks at a fast/slow pace]
She joined a group of 'walkers' in the neighborhood.
(..) Not a very strong proposition, is it? Archmaester, with respect, I've seen them... The Army of the Dead. The white walkers. I was sent here to learn how to defeat them, but everyone in the Citadel, those who will even talk to me, they all doubt the walkers ever (..)2017 TvShow: Game of Thrones Title: Dragonstone Season: 7 Episode 1
(..) Okay, come on. Let's get them inside. I want every northern maester to scour their records for any mention of dragonglass. Dragonglass kills white walkers. It's more valuable to us now than gold. We need to find it, we need to mine it, we need to make weapons from it. (..)2017 TvShow: Game of Thrones Title: Dragonstone Season: 7 Episode 1