GC: npl

S: http://www.infoplease.com/ipa/A0001437.html (last access: 12 April 2013); http://www.wvi.org/disaster-management/what-humanitarian-disaster (last access: 3 September 2014); http://www.un.org/en/globalissues/humanitarian/ (last access: 3 September 2014).

N: disaster (n):

• something (such as a flood, tornado, fire, plane crash, etc.) that happens suddenly and causes much suffering or loss to many people.
• something that has a very bad effect or result.
• a complete or terrible failure.

S: MW – http://www.merriam-webster.com/dictionary/disaster (last access: 30 May 2015).

SYN:
S:

CR: erosion, eruption, natural disaster, vulnerability.