What is an example of a compound adjective without hyphen?

You're right, compound adjectives are generally hyphenated when they precede the noun they modify. However, there are some exceptions!

Here are examples of compound adjectives without hyphens:

* high school (referring to a type of school)

* full time (referring to a type of work schedule)

* middle aged (referring to a person's age)

* part time (referring to a type of work schedule)

* real estate (referring to a type of property)

It's important to note that these are exceptions, and the majority of compound adjectives will require hyphens.

If you're unsure whether to use a hyphen, it's always a good idea to consult a style guide or dictionary.