speed vs scud

speed and scud both are nouns.

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

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

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

As verbs, scud is a hyponym of speed; that is, scud 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, dart, dash, flash, scoot, shoot.

speed (noun)	scud (noun)
changing location rapidly	the act of moving along swiftly (as before a gale)
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

speed (verb)	scud (verb)
move faster	run or move very quickly or hastily
cause to move faster	run before a gale
move very fast
travel at an excessive or illegal velocity
move hurridly