credential vs credentials

credential and credentials both are nouns.

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

As nouns, credential and credentials are synonyms defined as:

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

Other synonyms of credential include certificate, certification.

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