speciousness vs deceptiveness

speciousness and deceptiveness both are nouns.

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

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

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

Other hypernyms of speciousness include obliquity.

speciousness (noun)	deceptiveness (noun)
an appearance of truth that is false or deceptive; seeming plausibility	the quality of being deceptive