precipitancy vs hastiness

precipitancy and hastiness both are nouns.

Word	Noun	Adjective	Verb	Adverb
precipitancy	Yes	No	No	No
hastiness	Yes	No	No	No

As nouns, hastiness is a hypernym of precipitancy; that is, hastiness is a word with a broader meaning than precipitancy:

precipitancy: the quality of happening with headlong haste or without warning
hastiness: overly eager speed (and possible carelessness)

Other hypernyms of precipitancy include haste, hurriedness, hurry, precipitation.

precipitancy (noun)	hastiness (noun)
the quality of happening with headlong haste or without warning	hasty impulsiveness
	overly eager speed (and possible carelessness)