Final answer:
When two words are joined with a hyphen, a complex word is created.
Step-by-step explanation:
When you join two words with a hyphen, you have created a complex word. Hyphenated words are created to convey a specific meaning or to create new words with a combination of the two original words. For example, in the word 'well-known', the hyphen joins 'well' and 'known' to create a single adjective that means widely recognized or familiar.
Learn more about Hyphenated words and their meanings