antediluvian patriarch vs antediluvian

antediluvian patriarch and antediluvian both are nouns.

Word	Noun	Adjective	Verb	Adverb
antediluvian patriarch	Yes	No	No	No
antediluvian	Yes	Yes	No	No

As nouns, antediluvian patriarch and antediluvian are synonyms defined as:

antediluvian patriarch and antediluvian: any of the early patriarchs who lived prior to the Noachian deluge

antediluvian patriarch (noun)	antediluvian (noun)
any of the early patriarchs who lived prior to the Noachian deluge	a very old person
	any of the early patriarchs who lived prior to the Noachian deluge

antediluvian patriarch (adjective)	antediluvian (adjective)
	of or relating to the period before the biblical flood
	so extremely old as seeming to belong to an earlier period