Immemorial is an adjective.
From Time Immemorial was created in 1984.
in immemorial times they built stone hedges or back immemorial times they liked to listen to records.
in immemorial of time i built a camp fire
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.
The part of speech for "twirl" is a verb.
The part of speech for "explicit" is an adjective.