voice communication vs spoken communication

voice communication and spoken communication both are nouns.

Word	Noun	Adjective	Verb	Adverb
voice communication	Yes	No	No	No
spoken communication	Yes	No	No	No

As nouns, voice communication and spoken communication are synonyms defined as:

voice communication and spoken communication: (language) communication by word of mouth

Other synonyms of voice communication include language, oral communication, speech, speech communication, spoken language.

voice communication (noun)	spoken communication (noun)
(language) communication by word of mouth	(language) communication by word of mouth