gospel truth vs gospel

gospel truth and gospel both are nouns.

Word	Noun	Adjective	Verb	Adverb
gospel truth	Yes	No	No	No
gospel	Yes	No	No	No

As nouns, gospel truth and gospel are synonyms defined as:

gospel truth (noun)	gospel (noun)
an unquestionable truth	a doctrine that is believed to be of great importance
	the written body of teachings of a religious group that are generally accepted by that group
	an unquestionable truth
	folk music consisting of a genre of a cappella music originating with Black slaves in the United States and featuring call and response; influential on the development of other genres of popular music (especially soul)