What kind of noun is bread and butter?

"Bread and butter" is a compound noun. It's formed by combining two separate nouns, "bread" and "butter," to create a new noun with a distinct meaning.

Here's why it's a compound noun:

* Combined meaning: "Bread and butter" refers to a basic and essential food source, not just the literal ingredients.

* Syntactic unity: The phrase acts as a single unit, often used as a subject or object in a sentence.

It's worth noting that "bread and butter" can also be used as a figure of speech to describe something that is essential or fundamental.