birth control pill vs anovulatory drug

birth control pill and anovulatory drug both are nouns.

Word	Noun	Adjective	Verb	Adverb
birth control pill	Yes	No	No	No
anovulatory drug	Yes	No	No	No

As nouns, birth control pill and anovulatory drug are synonyms defined as:

birth control pill and anovulatory drug: a contraceptive in the form of a pill containing estrogen and progestin to inhibit ovulation and so prevent conception

Other synonyms of birth control pill include anovulant, contraceptive pill, oral contraceptive, oral contraceptive pill, pill.

birth control pill (noun)	anovulatory drug (noun)
a contraceptive in the form of a pill containing estrogen and progestin to inhibit ovulation and so prevent conception	a contraceptive in the form of a pill containing estrogen and progestin to inhibit ovulation and so prevent conception