The word itself is a pronoun. It can be reflexive and emphatic.
adverb
what part of speech is beneath
i want to know what part of speech is camping
The part of speech is a adjective
Oppose is a verb.
The individual word "sentence" is a common noun. However, a sentence itself is comprised of many different parts of speech.
Brown can be used as both an adjective (describing a color) and a noun (referring to the color itself).
The word asterisk is a noun. It is the name of the symbol. The symbol itself (*) is just that, a symbol.
Introducing yourself can be a part of a speech, but it is not necessarily a speech in itself. It is typically the first part of a presentation or talk where you provide some background information about yourself before diving into the main topic.
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.