He is a fast/slow 'walker'. [=he walks at a fast/slow pace]
She joined a group of 'walkers' in the neighborhood.
(..) - The time for what? For you to become me. But am I ready? No. We can't defend the north from the walkers and the south from the Boltons. If we want to survive, we need Winterfell and to take Winterfell, we need more men. (..)2016 TvShow: Game of Thrones Title: The Door Season: 6 Episode 5
(..) (screaming) (screaming stops) (ice crackling) (gasps) It was you. You made the white walkers. We were at war. We needed to defend ourselves. From whom? From you. From men. (..)2016 TvShow: Game of Thrones Title: The Door Season: 6 Episode 5