fugacity vs fugaciousness

fugacity and fugaciousness both are nouns.

Word	Noun	Adjective	Verb	Adverb
fugacity	Yes	No	No	No
fugaciousness	Yes	No	No	No

As nouns, fugacity and fugaciousness are synonyms defined as:

fugacity and fugaciousness: the lack of enduring qualities (used chiefly of plant parts)

fugacity (noun)	fugaciousness (noun)
the lack of enduring qualities (used chiefly of plant parts)	the lack of enduring qualities (used chiefly of plant parts)
the tendency of a gas to expand or escape