aphonia vs voicelessness

aphonia and voicelessness both are nouns.

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

As nouns, aphonia and voicelessness are synonyms defined as:

aphonia and voicelessness: a disorder of the vocal organs that results in the loss of voice

aphonia (noun)	voicelessness (noun)
a disorder of the vocal organs that results in the loss of voice	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