speed vs acceleration

speed and acceleration both are nouns.

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

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

Other hyponyms of speed include quickening, speedup, deceleration, scud, scudding.

speed (noun)	acceleration (noun)
changing location rapidly	the act of accelerating; increasing the speed
a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression	an increase in rate of change
a rate (usually rapid) at which something happens	(physics) a rate of increase of velocity
the ratio of the focal length to the diameter of a (camera) lens system
distance travelled per unit time

speed (verb)	acceleration (verb)
move faster
cause to move faster
move very fast
travel at an excessive or illegal velocity
move hurridly