preventive vs prophylactic device

preventive and prophylactic device both are nouns.

Word	Noun	Adjective	Verb	Adverb
preventive	Yes	Yes	No	No
prophylactic device	Yes	No	No	No

As nouns, preventive and prophylactic device are synonyms defined as:

preventive and prophylactic device: an agent or device intended to prevent conception

Other synonyms of preventive include birth control device, contraceptive, contraceptive device, preventative.

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