speciousness vs meretriciousness

speciousness and meretriciousness both are nouns.

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

As nouns, speciousness and meretriciousness are synonyms defined as:

speciousness and meretriciousness: an appearance of truth that is false or deceptive; seeming plausibility

speciousness (noun)	meretriciousness (noun)
an appearance of truth that is false or deceptive; seeming plausibility	an appearance of truth that is false or deceptive; seeming plausibility
	tasteless showiness