The death rate is the number of deaths per 1,000 individuals in a population in a year.
Death Rate cheat sheet for homework
This term refers to the measure of the number of deaths (in general or due to specific causes) in some particular population scaled to size over time.
Life Expectancy: It's an estimate on how long someone may live based on various demographic factors like their current age and sex.
Infant Mortality Rate: This term refers specifically to the death rate during the first year of life.