When two words are used together to make a new meaning, a compound word is formed. There are three types of compound word: open compound (ice cream); closed compound (doorknob); or hyphenated compound (long-term).
countryside headquarters themselves throughout waistcoat
living room dining table full moon.
long-term up-to-date high-tech empty-handed
What other compound words can you find?
When does a compound word need a hyphen?