antediluvian vs antediluvian patriarch

antediluvian and antediluvian patriarch both are nouns.

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

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

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

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

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