Anovulatory drug and Morning-after pill

Anovulatory drug noun - A contraceptive in the form of a pill containing estrogen and progestin to inhibit ovulation and so prevent conception.

Morning-after pill and anovulatory drug are semantically related. in oral contraceptive pill topic. In some cases you can use "Morning-after pill" instead a noun phrase "Anovulatory drug".

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.

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