Good Night or Goodnight: Which One Is Correct?

“Good night” is usually the correct form when you are saying goodbye to someone before they go to sleep. “Goodnight” is also used, especially in informal writing and as a noun or adjective in some contexts, but “good night” is the standard choice when used as a farewell. For example: Good night! Sleep well.

The confusion happens because English often combines words over time. Just as good morning and good afternoon are normally written as two words, good night is traditionally written as two words when it is a greeting or farewell. However, goodnight appears in dictionaries and is common in certain uses, particularly informal expressions and compounds. Knowing the difference helps you choose the natural form for texts, conversations, emails, and formal writing.

Quick Answer

“Good night” is the standard two-word form when you wish someone a pleasant night or say goodbye before bedtime. “Goodnight” is also an accepted word in English, but it is less common as a standalone farewell. In most everyday situations, choose “Good night!”

Why Do People Confuse It?

People confuse good night and goodnight because they sound exactly the same when spoken.

English also has many words that have changed from separate words into compounds over time. This makes spelling especially confusing for learners.

Compare:

• Good morning! — two words
• Good afternoon! — two words
• Good evening! — two words
• Good night! — usually two words

The safest rule is simple: when you are directly wishing someone a pleasant night, write “good night.”

Is “Good Night” One Word or Two?

The standard expression is good night, written as two words.

It is commonly used as a farewell or as a wish for pleasant sleep.

Examples:

• Good night, Mom.
• Good night! See you tomorrow.
• I said good night before leaving.
• Good night and sleep well.

Here, good describes the kind of night you are wishing someone.

What About “Goodnight”?

Goodnight is a legitimate English word, but its use is more limited.

It can appear as a noun, adjective, or informal expression, depending on the sentence and dictionary tradition.

For example:

• She gave him a goodnight kiss.
• The children said their goodnights before going upstairs.

However, when you are simply saying farewell at bedtime, “Good night!” is the clearest and most natural choice.

Good Night vs Goodnight: Comparison Table

Feature	Good night	Goodnight
Spelling	Two words	One word
Common farewell	Yes	Less common
“Good night!”	Standard	Possible, but less typical
Noun use	Less typical	Yes, in some contexts
Formal writing	Preferred for farewell	More limited
Example	Good night, everyone.	She gave him a goodnight kiss.

When Should You Use “Good Night”?

Use good night when you are saying goodbye in the evening or wishing someone pleasant sleep.

1. As a bedtime farewell

Good night, Dad. Sleep well.

2. When leaving someone at night

It was getting late, so I said good night and went home.

3. In a text message

Good night! Talk to you tomorrow. ❤️

4. When wishing someone pleasant sleep

Good night. I hope you sleep peacefully.

5. When ending a conversation

I have to wake up early. Good night!

10+ Examples of “Good Night”

1. Good night, everyone!
2. Good night, Mom.
3. Good night! See you tomorrow.
4. I’m tired, so I’m going to bed. Good night.
5. She said good night before leaving.
6. Good night and sweet dreams.
7. He called his parents to say good night.
8. It’s late, so good night!
9. Good night, my friend.
10. The children said good night to their grandparents.
11. I should get some sleep. Good night!
12. Good night, everyone. Have a peaceful sleep.

Common Mistakes

Mistake 1: Always writing “goodnight”

Some people write:

❌ Goodnight, Mom!

Although this may appear in informal communication, Good night, Mom! is the safer standard form for a farewell.

Mistake 2: Assuming every “good night” must be one word

The expression is normally written as two words when it functions as a farewell.

✅ Good night!
❌ Goodnight! — not the preferred standard form for this use

Mistake 3: Confusing “good night” with “goodnight” compounds

A compound expression can use goodnight differently:

She gave him a goodnight kiss.

Here, goodnight modifies kiss, so the one-word form can be appropriate.

Memory Trick

Remember this simple rule:

Saying goodbye? → Good night.
Describing a noun? → Goodnight can be used as a compound.

Think:

Good night! = “I wish you a good night.”

For most messages, conversations, and bedtime farewells, two words are the safest choice.

American vs British English

There is no major American-versus-British spelling difference for the standard farewell good night.

Both American and British English commonly use:

Good night!

You may encounter goodnight in both varieties, especially in informal contexts and compounds.

For example:

• American English: Good night! See you tomorrow.
• British English: Good night! See you tomorrow.

So this is not primarily a US-versus-UK spelling issue. The important distinction is how the expression functions in the sentence.

Similar Words and Expressions

Several expressions are related to good night, but they are not always interchangeable.

• Good evening — used as an evening greeting.
• Good night — usually used when saying goodbye or wishing someone pleasant sleep.
• Sleep well — a direct wish for restful sleep.
• Sweet dreams — a friendly wish for pleasant dreams.
• Night-night — an informal or child-friendly bedtime expression.
• Have a good night — a longer expression used to wish someone a pleasant evening or night.
• Goodbye — a general farewell that is not specifically connected to bedtime.

Good Evening vs Good Night

A useful distinction is:

Good evening! = greeting someone in the evening.

Good night! = usually saying goodbye at night.

For example:

When you arrive:

Good evening, Mr. Smith.

When you leave:

Good night, Mr. Smith.

Final Verdict

“Good night” is the best choice when you are saying goodbye or wishing someone a pleasant night.

“Goodnight” is also an established English word, particularly in compounds such as goodnight kiss, and it can appear as a noun in some contexts.

If you are unsure which form to use, remember:

For a bedtime farewell, use “good night.”

FAQs:

Is “good night” two words or one?

Good night is normally written as two words when it is used as a farewell or a wish for pleasant sleep.

Is “goodnight” grammatically correct?

Yes. Goodnight is an established English word, but its use differs from the standard farewell good night. It can occur in compounds and noun expressions.

Should I write “Goodnight” in a text message?

You can, especially in informal texting, but “Good night!” is the safer and more standard form when saying goodbye.

Which is correct: “Good night” or “goodnight”?

Both forms exist, but they are used differently. Good night is the standard choice for the common farewell, while goodnight is often used in compounds or noun expressions.

Is “good night” a greeting?

It can be used as a nighttime expression, but unlike good morning or good evening, good night is most commonly used when leaving or ending a conversation.

Is “goodnight kiss” one word?

Yes. Goodnight kiss is commonly written with goodnight as one word because it functions as a compound modifier describing the kiss.

What is the difference between “good evening” and “good night”?

Good evening is generally used to greet someone in the evening, while good night is generally used when saying goodbye or wishing someone pleasant sleep.

Can I say “good night” to someone who is not going to sleep?

Yes. You can use good night as a nighttime farewell even when the person is not immediately going to bed.

Remember This

• Good night = standard bedtime farewell.
• Goodnight = established word used in certain compounds and noun expressions.
• Good night! is the safest choice in everyday conversation.
• Goodnight kiss is commonly written as one word.
• Good evening is generally a greeting; good night is generally a farewell.

Conclusion

The most useful rule is simple: write “good night” as two words when you are saying goodbye or wishing someone a pleasant night. This is the form you will normally want in conversations, messages, school writing, and other everyday situations.

Goodnight is not simply a spelling mistake, however. It has established uses, especially in compounds such as goodnight kiss. Understanding the function of the expression rather than memorizing a single spelling rule will help you use both forms naturally and accurately.