uncertainness vs precariousness

uncertainness and precariousness both are nouns.

Word	Noun	Adjective	Verb	Adverb
uncertainness	Yes	No	No	No
precariousness	Yes	No	No	No

As nouns, uncertainness and precariousness are synonyms defined as:

uncertainness and precariousness: being unsettled or in doubt or dependent on chance

Other synonyms of uncertainness include uncertainty.

uncertainness (noun)	precariousness (noun)
being unsettled or in doubt or dependent on chance	extreme dangerousness
	being unsettled or in doubt or dependent on chance