sonority vs plangency

sonority and plangency both are nouns.

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

As nouns, sonority and plangency are synonyms defined as:

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

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

sonority (noun)	plangency (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