Correct spelling, explanation: the correct spelling is good morning because good is an adjective and morning is a noun, and in English, it is customary to separate adjectives from nouns with a space. Therefore, good morning is the only proper way to write the phrase, which is commonly used as a greeting to say hello or express good wishes for the start of the day. Goodmorning is just a mistake.

Definition of good morning:
phrase, something you say to greet someone politely when you meet them in the morning
Good morning! I hope you slept well and are ready for a productive day ahead.
It’s always nice to start the day with a warm cup of coffee and a cheerful good morning greeting from a loved one.

Collocations with good morning:
Some most commonly used collocations include: to have a good morning, good morning routine
I had a good morning today because I woke up early, went for a jog, and had a delicious breakfast.
Having a good morning routine can help set the tone for the rest of your day and increase your overall productivity.

Incorrect spelling, explanation: goodmorning is considered a mistake because in English, words that are made up of two separate words (like good and morning) are usually spelled with a space between them. Therefore, it is always recommended to write good morning as two separate words to ensure proper spelling and grammar.

Incorrect spelling

Incorrect spelling

Incorrect spelling