Abortion pill and Birth-control pill

Abortion pill noun - An abortion-inducing drug (trade name RU_486) developed in France; when taken during the first five weeks of pregnancy it blocks the action of progesterone so that the uterus sloughs off the embryo.

Birth-control pill and abortion pill are semantically related. In some cases you can use "Birth-control pill" instead a noun phrase "Abortion pill".

Abortion pill and birth-control pill are semantically related. Sometimes you can replace phrase "Abortion pill" with "Birth-control pill", this phrases are similar.