ringing vs plangency

ringing and plangency both are nouns.

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

As nouns, ringing and plangency are synonyms defined as:

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

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

ringing (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
the giving of a ring as a token of engagement
the sound of a bell ringing