Correct spelling, explanation: you should spell it as good evening as it is the correct and standard way to write the greeting. Good evening is a common phrase used to greet someone in the evening, and it should be written as two separate words. Writing it as one-word goodevening is not the correct spelling and can be considered a misspelling or an error.

Definition of good evening:
phrase, something you say to greet someone politely when you meet them in the evening
Good evening, sir, said the receptionist as I entered the hotel lobby.
Before the start of the play, the theater manager welcomed the audience with a warm Good evening, everyone!

Collocations with good evening:
Some most commonly used collocations include: have a good evening, good evening meal
As I left the restaurant, the waiter smiled and said, “Thank you for coming, have a good evening!”.
My family and I gathered around the dinner table for a delicious and hearty good evening meal.

Incorrect spelling, explanation: goodevening is a mistake because it is not the correct way to spell the phrase good evening. Good evening is made up of two separate words that should always be written separately. Spelling it as one-word goodevening is incorrect and could lead to confusion or misunderstanding.

Incorrect spelling

Incorrect spelling

Incorrect spelling