Here are some examples:
* Mother-in-law: This is a single noun referring to the mother of your spouse.
* Part-time: This describes something that is done for only a portion of a typical working day or week.
* Well-being: This refers to a state of being healthy, happy, and prosperous.
* Six-pack: This refers to a package of six cans or bottles of a beverage, often beer.
* State-of-the-art: This describes something that is the most modern and advanced.
Hyphenation rules for compound nouns vary somewhat, so it's helpful to consult a dictionary if you are unsure.