CFR Case Fatality Rate: fraction of people diagnosed with an affliction that eventually died.
For example if the Sniffles has a CFR of 1%, then 99% of people diagnosed with Sniffles will survive.
Mortality rate: fraction of all deaths in a group, that are attributed to a specific affliction.
For example if mortality rate of Sniffles in Belgium is 4%, then 96% of deaths in Belgium are attributed to other afflictions.
For a comparison check out the following lists:
https://en.wikipedia.org/wiki/List_of_human_disease_case_fat...
https://en.wikipedia.org/wiki/List_of_causes_of_death_by_rat...
consider how mortality rates are extensive quantities i.e. proportional to the number of people infected while CFR's are intensive quantities i.e. independent of the number of people infected