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Both are correct but they are not the same. To wish someone "Good Night" is the correct form of the greeting in the same way as "Good Morning", "Good Afternoon" and "Good Evening" but we certainly wouldn't say "She gave me a good night kiss" What is a night kiss? To have a "good night kiss" a "night kiss" must be correct. This also suggests there is a bad night kiss?? No - as a greeting "Good Night" is correct but as an adjective (or arguably part of a compound noun) "goodnight ..." is more appropriate