Bad luck and Meltdown

Bad luck noun - An unfortunate state resulting from unfavorable outcomes.

Meltdown and bad luck are semantically related in catastrophe topic. In some cases you can use "Meltdown" instead a noun phrase "Bad luck".

Meltdown noun - Severe overheating of the core of a nuclear reactor resulting in the core melting and radiation escaping.

Bad luck and meltdown are semantically related in calamity topic. Sometimes you can use "Bad luck" instead a noun "Meltdown", if it concerns topics such as catastrophe.