For a person:
* Heureux/Heureuse (masculine/feminine) - This is the most general word meaning "happy" or "lucky."
* Chanceux/Chanceuse (masculine/feminine) - This is a more specific word meaning "lucky" in the sense of being fortunate or having good luck.
* Chance - This can also be used as a noun, meaning "luck" or "chance."
For a situation or event:
* Heureux/Heureuse (masculine/feminine) - This is the most common way to describe a lucky situation or event, meaning "fortunate" or "lucky."
* Chanceux/Chanceuse (masculine/feminine) - This can also be used for situations, but it's less common than "heureux/heureuse."
* Chance - This is a good option for talking about "luck" in a general sense, meaning "chance" or "opportunity."
Here are some examples:
* "Il est heureux d'avoir trouvé un emploi" - He is lucky to have found a job.
* "Elle est chanceuse d'avoir gagné à la loterie" - She is lucky to have won the lottery.
* "C'est un heureux événement" - This is a lucky event.
* "C'est une chance incroyable!" - It's an incredible chance!
It's important to choose the right word based on the context of your sentence.