BW defence vs defensive measure

BW defence and defensive measure both are nouns.

Word	Noun	Adjective	Verb	Adverb
BW defence	Yes	No	No	No
defensive measure	Yes	No	No	No

As nouns, defensive measure is a hypernym of BW defence; that is, defensive measure is a word with a broader meaning than BW defence:

BW defence: defense against biological warfare
defensive measure: (military) military action or resources protecting a country against potential enemies

Other hypernyms of BW defence include defence, defense.

BW defence (noun)	defensive measure (noun)
defense against biological warfare	(military) military action or resources protecting a country against potential enemies