speciousness vs obliquity

speciousness and obliquity both are nouns.

Word	Noun	Adjective	Verb	Adverb
speciousness	Yes	No	No	No
obliquity	Yes	No	No	No

As nouns, obliquity is a hypernym of speciousness; that is, obliquity is a word with a broader meaning than speciousness:

speciousness: an appearance of truth that is false or deceptive; seeming plausibility
obliquity: the quality of being deceptive

Other hypernyms of speciousness include deceptiveness.

speciousness (noun)	obliquity (noun)
an appearance of truth that is false or deceptive; seeming plausibility	the quality of being deceptive
	the presentation during labor of the head of the fetus at an abnormal angle