soprano vs high-pitched

soprano is a noun but high-pitched is not a noun.

Word	Noun	Adjective	Verb	Adverb
soprano	Yes	Yes	No	No
high-pitched	No	Yes	No	No

soprano (noun)	high-pitched (noun)
the pitch range of the highest female voice
the highest female voice; the voice of a boy before puberty
a female singer with the highest vocal range of all the voice type

soprano (adjective)	high-pitched (adjective)
having or denoting a high range	used of sounds and voices; high in pitch or frequency
	set at a sharp or high angle or slant