oral communication vs spoken language

oral communication and spoken language both are nouns.

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

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

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

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

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