security measures vs safeguard

security measures and safeguard both are nouns.

Word	Noun	Adjective	Verb	Adverb
security measures	Yes	No	No	No
safeguard	Yes	No	Yes	No

As nouns, safeguard is a hypernym of security measures; that is, safeguard is a word with a broader meaning than security measures:

security measures: measures taken as a precaution against theft or espionage or sabotage etc.
safeguard: a precautionary measure warding off impending danger or damage or injury etc.

Other hypernyms of security measures include guard, precaution.

security measures (noun)	safeguard (noun)
measures taken as a precaution against theft or espionage or sabotage etc.	a precautionary measure warding off impending danger or damage or injury etc.
	a document or escort providing safe passage through a region especially in time of war

security measures (verb)	safeguard (verb)
	make safe
	escort safely