What is solid compound noun?

A solid compound noun is a noun that is formed by combining two or more words to create a single new noun. These words are written together as one word, without any spaces or hyphens.

Here are some examples of solid compound nouns:

* bathroom (bath + room)

* notebook (note + book)

* rainbow (rain + bow)

* baseball (base + ball)

* sunrise (sun + rise)

Key characteristics of solid compound nouns:

* Single word: They are written as a single word without spaces or hyphens.

* Combined meaning: The meaning of the compound noun is different from the individual words it is made of.

* Commonly used: Solid compound nouns are usually common words that are widely used in everyday language.

Note: There are also hyphenated compound nouns (e.g., "mother-in-law," "well-being") and open compound nouns (e.g., "high school," "living room"). These are not solid compound nouns because they have spaces or hyphens between the words.