This cropped up when I was in a conversation with a friend. I guess fatal must talk of something which has necessarily resulted in death, while lethality is more about potential to cause death. Yet I am not convinced by this explanation, because lethality is associated with specific agents of death, like injection, dosage of medicine, weapons, etc.
Could someone pin the exact difference in usage between these words? Are the following sentences alright, for instance?
- He has been diagnosed with a lethal type of cancer.
- He died after getting hit by the fatal weapon.