unvoiced vs unspoken

unvoiced and unspoken both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unvoiced	No	Yes	No	No
unspoken	No	Yes	No	No

As adjectives, unvoiced and unspoken are synonyms defined as:

Other synonyms of unvoiced include unexpressed, unsaid, unstated, unuttered, unverbalised, unverbalized.

unvoiced (adjective)	unspoken (adjective)
produced without vibration of the vocal cords	not made explicit
not made explicit	expressed without speech