Endearment is a noun.
The word "mummy" can be a noun, referring to a preserved human or animal body. Additionally, it can also be a noun referring to a term of endearment used for one's mother.
Boo is an interjection. When used as the name of a person, it is a proper noun.
The word liebchen is a noun in German. It means sweetheart.
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.