Adjectives

(s)down, downwardextending or moving from a higher to a lower place“the down staircase”, “the downward course of the stream”
(s)downwardon or toward a surface regarded as a base“he lay face downward”, “the downward pull of gravity”

Adverbs

(r)down, downwards, downward, downwardlyspatially or metaphorically from a higher to a lower level or position“don't fall down”, “rode the lift up and skied down”, “prices plunged downward”