Is good luck one word?

Good luck is always two words. It’s an idiom that you can use by itself with an exclamation point (e.g., “Good luck!) or with a prepositional phrase (e.g., “Good luck at the game!”). You can also use “good luck” as a noun phrase in complete sentences (e.g., “I’m sending you lots of good luck for your interview”).

“Good luck” is never one word, but sometimes it’s hyphenated. Use a hyphen when “good-luck” is a compound adjective that modifies a noun (e.g., “That red bandana is my good-luck charm”).

A QuillBot Grammar Check can help you avoid errors with “good luck” and other English expressions.