prophylactic device vs preventive

prophylactic device and preventive both are nouns.

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

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

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

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

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

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