voiceless vs voicelessness

voiceless is not a noun while voicelessness is a noun.

Word	Noun	Adjective	Verb	Adverb
voiceless	No	Yes	No	No
voicelessness	Yes	No	No	No

voiceless (noun)	voicelessness (noun)
	having no voice in the management or control of affairs
	speaking softly without vibration of the vocal cords
	(phonetics, of a consonant) The property of being spoken without vibration of the vocal cords, as [t], [s], or [f].
	a disorder of the vocal organs that results in the loss of voice

voiceless (adjective)	voicelessness (adjective)
deprived of the rights of citizenship especially the right to vote
produced without vibration of the vocal cords
being without sound through injury or illness and thus incapable of all but whispered speech
uttered without voice