fugacity vs transitoriness

fugacity and transitoriness both are nouns.

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

As nouns, transitoriness is a hypernym of fugacity; that is, transitoriness is a word with a broader meaning than fugacity:

fugacity: the lack of enduring qualities (used chiefly of plant parts)
transitoriness: an impermanence that suggests the inevitability of ending or dying

Other hypernyms of fugacity include transience, transiency.

fugacity (noun)	transitoriness (noun)
the lack of enduring qualities (used chiefly of plant parts)	an impermanence that suggests the inevitability of ending or dying
the tendency of a gas to expand or escape