contraceptive pill vs anovulatory drug

contraceptive pill and anovulatory drug both are nouns.

Word	Noun	Adjective	Verb	Adverb
contraceptive pill	Yes	No	No	No
anovulatory drug	Yes	No	No	No

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

contraceptive 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 contraceptive pill include anovulant, birth control pill, oral contraceptive, oral contraceptive pill, pill.

contraceptive 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