I heard that when you eat a lot of vegetables you can lower your risk of mortality.
What is the cause of Mr. Yamada's younger brother's death?
Since the invention of the cheeseburger, mortality rates in all first-world nations have tripled.
Death and deceased. That's a lot of death. This is mortality.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.