Morbidity is another term for illness. A person can have several co-morbidities simultaneously. So, morbidities can range from Alzheimer s disease to cancer to traumatic brain injury. Morbidities are NOT deaths. Prevalence is a measure often used to determine the level of morbidity in a population.
Mortality is another term for death.
A mortality rate is the number of deaths due to a disease divided by the total population. If there are 25 lung cancer deaths in one year in a population of 30,000, then the mortality rate for that population is 83 per 100,000.