plangency vs vibrancy

plangency and vibrancy both are nouns.

Word	Noun	Adjective	Verb	Adverb
plangency	Yes	No	No	No
vibrancy	Yes	No	No	No

As nouns, plangency and vibrancy are synonyms defined as:

plangency and vibrancy: having the character of a loud deep sound; the quality of being resonant

Other synonyms of plangency include resonance, reverberance, ringing, sonority, sonorousness.

plangency (noun)	vibrancy (noun)
having the character of a loud deep sound; the quality of being resonant	having the character of a loud deep sound; the quality of being resonant