Try failure, fall, fell stroke, fiasco, or flop.
a synonym for crisis: disaster.
A synonym for tender beginning with 'a' is affectionate.
catastrophe?
A disaster beginning with 'N' could be a natural disaster like a tsunami. A disaster beginning with 'P' could be a pandemic or a hurricane, for example.
Disaster
shock
Disaster
One option is the word disaster.
A synonym starting with d of the word calamity is 'disaster'
"Disaster" is probably the closest synonym, but "distress" rather close.
the synonym of ride can be to drive or to f***.
A disaster, like a calamity is a hugely problematic turn of events.