doubtfulness vs precariousness

doubtfulness and precariousness both are nouns.

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

As nouns, precariousness is a hypernym of doubtfulness; that is, precariousness is a word with a broader meaning than doubtfulness:

doubtfulness: uncertainty about the truth or factuality or existence of something
precariousness: being unsettled or in doubt or dependent on chance

Other hypernyms of doubtfulness include uncertainness, uncertainty.

doubtfulness (noun)	precariousness (noun)
uncertainty about the truth or factuality or existence of something	extreme dangerousness
the state of being unsure of something	being unsettled or in doubt or dependent on chance