Adjectives made from two or more words joined by hyphens
Word-word + noun (hyphenate before noun)
Not applicable
Not applicable
💡 Hyphenate compound adjectives BEFORE a noun. After a noun, usually no hyphen: The author is well known.
✓She's a well-known actress.
✗She's a well known actress.
Compound adjective before noun needs hyphen.
✓The actress is well known.
✗The actress is well-known.
After the noun, no hyphen needed (though both are acceptable).
✓It's a two-hour flight.
✗It's a two-hours flight.
Number compounds use singular noun: two-hour, not two-hours.