prophylactic vs antifertility

prophylactic is a noun but antifertility is not a noun.

Word	Noun	Adjective	Verb	Adverb
prophylactic	Yes	Yes	No	No
antifertility	No	Yes	No	No

As adjectives, prophylactic and antifertility are synonyms defined as:

prophylactic and antifertility: capable of preventing conception or impregnation

Other synonyms of prophylactic include contraceptive.

prophylactic (noun)	antifertility (noun)
contraceptive device consisting of a sheath of thin rubber or latex that is worn over the penis during intercourse
remedy that prevents or slows the course of an illness or disease

prophylactic (adjective)	antifertility (adjective)
preventing or contributing to the prevention of disease	capable of preventing conception or impregnation
warding off
capable of preventing conception or impregnation