spoken language vs speech communication

spoken language and speech communication both are nouns.

Word	Noun	Adjective	Verb	Adverb
spoken language	Yes	No	No	No
speech communication	Yes	No	No	No

As nouns, spoken language and speech communication are synonyms defined as:

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

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

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