colouration vs timbre

colouration and timbre both are nouns.

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

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

colouration: the timbre of a musical sound
timbre: (music) the distinctive property of a complex sound (a voice or noise or musical sound)

Other hypernyms of colouration include quality, timber, tone.

colouration (noun)	timbre (noun)
choice and use of colors (as by an artist)	(music) the distinctive property of a complex sound (a voice or noise or musical sound)
appearance with regard to color
the timbre of a musical sound