Pier is a noun. It names a thing.
part of speech
The part of speech for this particular word is a noun.
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
I have read in an old newspaper that Joe Levine had tried to get Pier Angeli or Rosanna Podestra for the "Djalma" part in Wonders of Aladdin.
The part of speech for "explicit" is an adjective.
The part of speech for "twirl" is a verb.
The part of speech for "unfamiliar" is an adjective.
The part of speech of "came" is a verb.
The part of speech for "lecturer" is a noun.
The part of speech for "indefinite" is an adjective.