speech communication vs spoken language

speech communication and spoken language both are nouns.

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

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

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

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

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