voiceless vs aphonic

voiceless and aphonic both are adjectives.

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

As adjectives, voiceless and aphonic are synonyms defined as:

voiceless and aphonic: being without sound through injury or illness and thus incapable of all but whispered speech

voiceless (adjective)	aphonic (adjective)
deprived of the rights of citizenship especially the right to vote	being without sound through injury or illness and thus incapable of all but whispered speech
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