step vs footstep

step and footstep both are nouns.

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

As nouns, footstep is a hyponym of step; that is, footstep is a word with a more specific, narrower meaning than step:

Other hyponyms of step include pace, stride, tread, pas, trip, sidestep.

As nouns, step and footstep are synonyms defined as:

Other synonyms of step include footfall.

As nouns, step and footstep are synonyms defined as:

Other synonyms of step include pace, stride.

step (noun)	footstep (noun)
the act of changing location by raising the foot and setting it down	the act of taking a step in walking
any maneuver made as part of progress toward a goal	the sound of a step of someone walking
a sequence of foot movements that make up a particular dance	the distance covered by a step
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

step (verb)	footstep (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