security system vs security measure

security system and security measure both are nouns.

Word	Noun	Adjective	Verb	Adverb
security system	Yes	No	No	No
security measure	Yes	No	No	No

As nouns, security system and security measure are synonyms defined as:

security system and security measure: an electrical device that sets off an alarm when someone tries to break in

Other synonyms of security system include security.

security system (noun)	security measure (noun)
an electrical device that sets off an alarm when someone tries to break in	an electrical device that sets off an alarm when someone tries to break in
(computing) a system that enforces boundaries between computer networks