What is a descriptive part of speech?

There isn't a grammatical term called "descriptive part of speech." However, the concept of "descriptive" is associated with several parts of speech, primarily:

* Adjectives: These words modify nouns and pronouns, adding information about their qualities, size, color, shape, etc. Examples: beautiful, large, red, round.

* Adverbs: These words modify verbs, adjectives, or other adverbs, providing information about how, when, where, or to what extent something is done. Examples: quickly, loudly, yesterday, very.

While these are the primary parts of speech used to describe, other parts of speech can also contribute to descriptive language:

* Nouns: While nouns themselves don't "describe" in the same way as adjectives, they can be used to create vivid images and evoke sensory details. For example, "The aroma of freshly baked bread filled the kitchen."

* Verbs: Some verbs, particularly those that describe actions or states of being, can be used descriptively. For example, "The leaves rustled in the wind."

* Prepositional phrases: These phrases can act as adjectives or adverbs, providing descriptive information about location, time, or manner. For example, "The book was on the table," "The meeting is tomorrow morning," "She walked with a limp."

Ultimately, descriptive language is about using words to create a clear, vivid, and engaging picture in the reader's mind. While adjectives and adverbs are essential for this, other parts of speech can also contribute to achieving this goal.