birth certificate vs credential

birth certificate and credential both are nouns.

Word	Noun	Adjective	Verb	Adverb
birth certificate	Yes	No	No	No
credential	Yes	No	No	No

As nouns, credential is a hypernym of birth certificate; that is, credential is a word with a broader meaning than birth certificate:

birth certificate: a copy of the official document giving details of a person's birth
credential: a document attesting to the truth of certain stated facts

Other hypernyms of birth certificate include certificate, certification, credentials.

birth certificate (noun)	credential (noun)
a copy of the official document giving details of a person's birth	a document attesting to the truth of certain stated facts