spoken communication vs voice communication

spoken communication and voice communication both are nouns.

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

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

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

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

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