shrillness vs timber

shrillness and timber both are nouns.

Word	Noun	Adjective	Verb	Adverb
shrillness	Yes	No	No	No
timber	Yes	No	No	No

As nouns, timber is a hypernym of shrillness; that is, timber is a word with a broader meaning than shrillness:

shrillness: having the timbre of a loud high-pitched sound
timber: (music) the distinctive property of a complex sound (a voice or noise or musical sound)

Other hypernyms of shrillness include quality, timbre, tone.

shrillness (noun)	timber (noun)
having the timbre of a loud high-pitched sound	a beam made of wood
the quality of being sharp or harsh to the senses	a post made of wood
	(music) the distinctive property of a complex sound (a voice or noise or musical sound)
	land that is covered with trees and shrubs
	the wood of trees cut and prepared for use as building material