Which is correct grammar goodnight or good night?

Related questions

1. What is another word for on the other hand?
2. What are examples of diversity?
3. What is a contradictory word?
4. How do you use whereas in the middle of a sentence?
5. Is it correct to say anyways?
6. How do you use whereas in a sentence?
7. Can whereas start a sentence?
8. How do you write whereas?
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Tags

1. #manner
2. #salutation
3. #thought
4. #goodnight
5. #conflicting
6. #phrase
7. #about
8. #standard
9. #pleasant
10. #subject
11. #spelled
12. #parts
13. #views
14. #separate
15. #someone
16. #saying
17. #first
18. #adjective
19. #night
20. #there
21. #sends