The word antediluvian is an adjective. It describes something which is ancient.
Those antediluvian machines are a thing of the past!
The antediluvian drains were clogged so the rain flooded the streets. My grandmother's ideas about gender-role steryotypes are antediluvian; she still believes that women should not have careers and that men should never cry in public
Extremely old and antiquated
Millennia is a noun.
Adjective.
The antediluvian period.
Those antediluvian machines are a thing of the past!
Royal Antediluvian Order of Buffaloes was created in 1822.
The antediluvian drains were clogged so the rain flooded the streets. My grandmother's ideas about gender-role steryotypes are antediluvian; she still believes that women should not have careers and that men should never cry in public
Extremely old and antiquated
The part of speech for this particular word is a noun.
part of speech
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
The part of speech for "unfamiliar" is an adjective.
The part of speech of "came" is a verb.