Here's why:
* Compound nouns are formed by combining two or more words to create a new word with a single meaning. Examples include:
* fireplace (fire + place)
* toothbrush (tooth + brush)
* high school (high + school)
* Compound is a single word that describes something made up of two or more parts. It's an adjective, not a noun.
Examples of compound nouns:
* heartbeat
* sunrise
* rainstorm
* grandparents
* bathroom
Let me know if you have any other words you'd like to check!