Infant deathrate and Mortality rate

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

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

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

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