hastiness vs haste

hastiness and haste both are nouns.

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

As nouns, hastiness and haste are synonyms defined as:

Other synonyms of hastiness include hurriedness, hurry, precipitation.

hastiness (noun)	haste (noun)
hasty impulsiveness	the act of moving hurriedly and in a careless manner
overly eager speed (and possible carelessness)	overly eager speed (and possible carelessness)
	a condition of urgency making it necessary to hurry