Infant mortality rate and Mortality rate

Infant mortality rate noun - The death rate during the first year of life.

Mortality rate and infant mortality rate are semantically related. In some cases you can use "Mortality rate" instead a noun phrase "Infant mortality rate".

Mortality rate noun - The ratio of deaths in an area to the population of that area; expressed per 1000 per year.

Infant mortality rate and mortality rate are semantically related. Sometimes you can replace phrase "Infant mortality rate" with "Mortality rate", this phrases are similar.