speed vs precipitation

speed and precipitation both are nouns.

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

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

Other hyponyms of speed include haste, hastiness, hurriedness, hurry, execution speed, graduality, gradualness.

speed (noun)	precipitation (noun)
changing location rapidly	an unexpected acceleration or hastening
a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression	overly eager speed (and possible carelessness)
a rate (usually rapid) at which something happens	the act of casting down or falling headlong from a height
the ratio of the focal length to the diameter of a (camera) lens system	the falling to earth of any form of water (rain or snow or hail or sleet or mist)
distance travelled per unit time	the process of forming a chemical precipitate
	the quantity of water falling to earth at a specific place within a specified period of time

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