ringing vs timbre

ringing and timbre both are nouns.

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

As nouns, timbre is a hypernym of ringing; that is, timbre is a word with a broader meaning than ringing:

ringing: having the character of a loud deep sound; the quality of being resonant
timbre: (music) the distinctive property of a complex sound (a voice or noise or musical sound)

Other hypernyms of ringing include quality, timber, tone.

ringing (noun)	timbre (noun)
having the character of a loud deep sound; the quality of being resonant	(music) the distinctive property of a complex sound (a voice or noise or musical sound)
the giving of a ring as a token of engagement
the sound of a bell ringing