credentials vs credential

credentials and credential both are nouns.

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

As nouns, credentials and credential are synonyms defined as:

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

Other synonyms of credentials include certificate, certification.

credentials (noun)	credential (noun)
a document attesting to the truth of certain stated facts	a document attesting to the truth of certain stated facts