What part of speech is simplest form?

"Simplest form" is not a single part of speech, but rather a phrase that acts as an adjective in a sentence.

Here's a breakdown:

* Simplest: This is an adjective, the superlative form of "simple."

* Form: This is a noun.

Together, "simplest form" describes a noun, indicating its most basic or reduced state.

Example:

* "The simplest form of the equation is x + y = 5." (Here, "simplest form" modifies the noun "form.")