What is the parts of speech for emphasis?

"Emphasis" itself is not a part of speech. It's a concept, a way of expressing language, rather than a specific word category.

Here's how emphasis works in relation to parts of speech:

* Emphasis can be achieved through various parts of speech. For example, you can emphasize a noun by using an adjective (e.g., "a *huge* problem"), a verb by using an adverb (e.g., "he *quickly* ran"), or an entire phrase by using an interjection (e.g., "Wow, that's *amazing*!")

* Emphasis can also be achieved through sentence structure and punctuation. You can use italics, boldface, or even capitalization to highlight specific words.

* Intonation and voice inflection play a crucial role in oral communication to emphasize certain words or phrases.

Essentially, emphasis is a technique, not a word class.