History is a noun.
noun
Yesterday is a noun in that sentence.
The part of speech for this particular word is a noun.
part of speech
The part of speech for "answer" is a noun.
what part of speech is beneath
adverb
The word "regal" is an adjective that describes something royal or majestic. It can be found throughout a speech to convey a sense of power, authority, and dignity.
Nothing
If you mean the part of speech, it is a noun. If you mean the etymology, it comes from Greek.
The part of speech for "explicit" is an adjective.
The part of speech for "lecturer" is a noun.