riser vs step

riser and step both are nouns.

Word	Noun	Adjective	Verb	Adverb
riser	Yes	No	No	No
step	Yes	No	Yes	No

riser (noun)	step (noun)
structural member consisting of the vertical part of a stair or step	the act of changing location by raising the foot and setting it down
a vertical pipe in a building	any maneuver made as part of progress toward a goal
a person who rises (especially from bed)	a sequence of foot movements that make up a particular dance
	support consisting of a place to rest the foot while ascending or descending a stairway
	a solid block joined to the beams in which the heel of a ship's mast or capstan is fixed
	a musical interval of two semitones
	a mark of a foot or shoe on a surface
	the sound of a step of someone walking
	the distance covered by a step
	a short distance
	relative position in a graded series

riser (verb)	step (verb)
	measure (distances) by pacing
	move or proceed as if by steps into a new situation
	place (a ship's mast) in its step
	shift or move by taking a step
	put down or press the foot, place the foot
	walk a short distance to a specified place or in a specified manner
	move with one's feet in a specific manner
	furnish with steps
	treat badly
	cause (a computer) to execute a single command