bustle about vs speed

bustle about is not a noun while speed is a noun.

Word	Noun	Adjective	Verb	Adverb
bustle about	No	No	Yes	No
speed	Yes	No	Yes	No

bustle about (noun)	speed (noun)
	changing location rapidly
	a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression
	a rate (usually rapid) at which something happens
	the ratio of the focal length to the diameter of a (camera) lens system
	distance travelled per unit time

bustle about (verb)	speed (verb)
move or cause to move energetically or busily	move faster
	cause to move faster
	move very fast
	travel at an excessive or illegal velocity
	move hurridly