* Two nouns: "fireplace," "toothbrush," "sunrise"
* A noun and an adjective: "bluebird," "blackboard," "highchair"
* A noun and a verb: "haircut," "raincoat," "checkup"
* A noun and an adverb: "downpour," "outbreak," "afterthought"
There are two main types of compound nouns:
* Closed compound nouns: These words are written as a single word, like "eyeglasses," "headache," "rainbow."
* Open compound nouns: These words are written as two separate words, like "high school," "full moon," "dining room."
* Hyphenated compound nouns: These words are written with a hyphen between them, like "mother-in-law," "well-being," "pass-through."
Here are some key features of compound nouns:
* They often refer to a single entity or concept.
* They can be used as a single unit in a sentence.
* They can be singular or plural.
* They can be modified by adjectives.
Understanding compound nouns helps you to expand your vocabulary and improve your reading comprehension.