countertenor vs high-pitched

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

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

countertenor (noun)	high-pitched (noun)
the highest adult male singing voice
a male singer with a voice above that of a tenor

countertenor (adjective)	high-pitched (adjective)
of or being the highest male voice; having a range above that of tenor	used of sounds and voices; high in pitch or frequency
	set at a sharp or high angle or slant