Mifepristone and Morning-after pill

Mifepristone 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.

Morning-after pill and mifepristone are semantically related. in oral contraceptive pill topic. In some cases you can use "Morning-after pill" instead a noun "Mifepristone".

Morning-after pill noun - A large dose of estrogen taken orally within 24 to 72 hours after intercourse; prevents implantation of a fertilized ovum and so acts as a contraceptive; commonly used after rape or incest.

Mifepristone and morning-after pill are semantically related. You can use "Mifepristone" instead a noun phrase "Morning-after pill".