Correct spelling, explanation: fortunately and luckily are synonyms, and they share similar meanings, expressing a sense of positive outcome or relief in a situation. While they are often used interchangeably, there are subtle differences in connotation and usage. The word fortunately tends to be associated with more formal or serious contexts. It is often used in situations where the positive outcome is a result of something advantageous or fortunate. Luckily is generally considered slightly less formal and might be more commonly used in everyday conversation. It can convey a more casual or informal tone.

Definition of luckily:
Adverb, in a lucky manner
Luckily, I had packed an extra umbrella, and it started raining just as I stepped outside.
The meeting was scheduled for 10 AM, and luckily, I caught an earlier train, so I arrived with time to spare.

Collocations with luckily:
Some most commonly used collocations include:
1. Luckily for us: used to express gratitude or relief for a fortunate outcome.
Luckily for us, the traffic cleared up, and we made it to the airport on time.
2. Luckily enough: indicates that there was sufficient luck or fortune in a situation.
We were lucky enough to find a parking spot right in front of the restaurant.
3. Luckily, no one was injured: describes a situation where there was a positive outcome in terms of safety.
Luckily, no one was injured in the minor car accident.
4. Luckily, it turned out: implies a positive resolution or discovery in a situation.
Luckily, it turned out that the missing document was saved on the computer.

Correct spelling, explanation: in many cases, the choice between fortunately and luckily is subjective, and you can use them interchangeably based on your preference and the tone you want to convey. If in doubt, you can opt for the one that feels more natural in the specific context you are writing or speaking. The choice between the two often comes down to personal style or the flow of a sentence. Both fortunately and luckily are often used with similar collocations like for us, enough, no one was hurt, etc.