preventive vs birth control device

preventive and birth control device both are nouns.

Word	Noun	Adjective	Verb	Adverb
preventive	Yes	Yes	No	No
birth control device	Yes	No	No	No

As nouns, preventive and birth control device are synonyms defined as:

preventive and birth control device: an agent or device intended to prevent conception

Other synonyms of preventive include contraceptive, contraceptive device, preventative, prophylactic device.

preventive (noun)	birth control device (noun)
remedy that prevents or slows the course of an illness or disease	an agent or device intended to prevent conception
an agent or device intended to prevent conception
any obstruction that impedes or is burdensome

preventive (adjective)	birth control device (adjective)
tending to prevent or hinder
preventing or contributing to the prevention of disease