step on it vs shoot

step on it is not a noun while shoot is a noun.

Word	Noun	Adjective	Verb	Adverb
step on it	No	No	Yes	No
shoot	Yes	No	Yes	No

As verbs, shoot is a hyponym of step on it; that is, shoot is a word with a more specific, narrower meaning than step on it:

Other hyponyms of step on it include barge, push forward, thrust ahead, buck, charge, shoot down, tear, dart, dash, flash, scoot, scud.

step on it (noun)	shoot (noun)
	the act of shooting at targets
	a new branch

step on it (verb)	shoot (verb)
move hurridly	give an injection to
	produce buds, branches, or germinate
	measure the altitude of by using a sextant
	record on photographic film
	make a film or photograph of something
	utter fast and forcefully
	fire a shot; release
	hit with a missile from a weapon
	score
	spend frivolously and unwisely
	force or drive (a fluid or gas) into by piercing
	throw or propel in a specific direction or towards a specific objective
	throw dice, as in a crap game
	variegate by interweaving weft threads of different colors
	run or move very quickly or hastily
	move quickly and violently
	send forth suddenly, intensely, swiftly
	cause a sharp and sudden pain in
	kill by firing a missile
	emit (as light, flame, or fumes) suddenly and forcefully