speculativeness vs uncertainty

speculativeness and uncertainty both are nouns.

Word	Noun	Adjective	Verb	Adverb
speculativeness	Yes	No	No	No
uncertainty	Yes	No	No	No

As nouns, uncertainty is a hypernym of speculativeness; that is, uncertainty is a word with a broader meaning than speculativeness:

speculativeness: the quality of being a conclusion or opinion based on supposition and conjecture rather than on fact or investigation
uncertainty: being unsettled or in doubt or dependent on chance

Other hypernyms of speculativeness include precariousness, uncertainness.

speculativeness (noun)	uncertainty (noun)
the quality of being a conclusion or opinion based on supposition and conjecture rather than on fact or investigation	being unsettled or in doubt or dependent on chance
financial risk	the state of being unsure of something