speed vs dart

speed and dart both are nouns.

Word	Noun	Adjective	Verb	Adverb
speed	Yes	No	Yes	No
dart	Yes	No	Yes	No

As verbs, dart is a hyponym of speed; that is, dart is a word with a more specific, narrower meaning than speed:

Other hyponyms of speed include fleet, flit, flutter, run, whizz, whizz along, zoom, zoom along.

As verbs, dart is a hyponym of speed; that is, dart is a word with a more specific, narrower meaning than speed:

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

speed (noun)	dart (noun)
changing location rapidly	a sudden quick movement
a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression	a tapered tuck made in dressmaking
a rate (usually rapid) at which something happens	a small narrow pointed missile that is thrown or shot
the ratio of the focal length to the diameter of a (camera) lens system
distance travelled per unit time

speed (verb)	dart (verb)
move faster	run or move very quickly or hastily
cause to move faster	move along rapidly and lightly; skim or dart
move very fast	move with sudden speed
travel at an excessive or illegal velocity
move hurridly