Sufferance is a type of patience, especially the patience to endure pain and suffering.
When you suffer, you're in some type of pain, whether physical or emotional. Sufferance is a quality possessed by people who endure such pains patiently and without complaining. Someone with cancer who never complains has great sufferance. Someone who endures the death of a spouse has sufferance. If you complain and whine about problems, that shows very little sufferance. This is word for dealing with painful things well and even heroically.