* Compound nouns: These are nouns made up of two or more words that function as a single unit. The hyphen helps to indicate that they are connected and act as one noun. Examples:
* sister-in-law
* well-being
* passer-by
* Hyphenated adjectives: These are adjectives formed by combining two or more words with a hyphen. They often describe a noun. Examples:
* state-of-the-art technology
* long-term investment
* light-hearted joke
* Numbers: Hyphens are used to connect numbers between twenty-one and ninety-nine. Example:
* forty-five
* Fractions: Hyphens are used in some fractions. Example:
* two-thirds
* Prefixes: Sometimes a hyphen is used to separate a prefix from the root word. Example:
* ex-husband
It's important to note that hyphenation rules can be complex and vary depending on context and style guide.