Birth control pill and Preventative

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

Preventative and birth control pill are semantically related. In some cases you can use "Preventative" instead a noun phrase "Birth control pill".

Preventative noun - Any obstruction that impedes or is burdensome.

Birth control pill and preventative are semantically related. Sometimes you can replace phrase "Birth control pill" with "Preventative", this terms are similar.