Hyphen Usage—Rules and Examples - Grammarly
https://www.grammarly.com/blog/hyphen14.01.2021 · Using hyphens to connect words is easy. Picking the right words to connect is a little harder. Let’s start with compound modifiers. A compound modifier is made up of two words that work together to function like one adjective. When you connect words with the hyphen, you make it clear to readers that the words work together as a unit of meaning.
Compound Adjectives - English Grammar
https://grammar.cl/english/compound-adjectives.htm03.03.2022 · English-speaking is an adjective (used to describe the country). We use a hyphen to connect the word English with speaking to show that it is one adjective (or one idea). This adjective with two words joined by the hyphen is called a compound adjective. Some more examples of compound adjectives are: Our office is in a twenty-storey building.