Mountain sickness and Morning sickness

Mountain sickness noun - Nausea and shortness of breath experienced by mountain climbers above ten thousand feet.

Morning sickness and mountain sickness are semantically related. In some cases you can use "Morning sickness" instead a noun phrase "Mountain sickness".

Morning sickness noun - Nausea early in the day; a characteristic symptom in the early months of pregnancy.

Mountain sickness and morning sickness are semantically related. You can use "Mountain sickness" instead a noun phrase "Morning sickness".