certification vs credential

certification and credential both are nouns.

Word	Noun	Adjective	Verb	Adverb
certification	Yes	No	No	No
credential	Yes	No	No	No

As nouns, certification and credential are synonyms defined as:

certification and credential: a document attesting to the truth of certain stated facts

Other synonyms of certification include certificate, credentials.

certification (noun)	credential (noun)
the act of certifying or bestowing a franchise on	a document attesting to the truth of certain stated facts
validating the authenticity of something or someone
confirmation that some fact or statement is true through the use of documentary evidence
a document attesting to the truth of certain stated facts