biological warfare defense vs biological warfare defence

biological warfare defense and biological warfare defence both are nouns.

Word	Noun	Adjective	Verb	Adverb
biological warfare defense	Yes	No	No	No
biological warfare defence	Yes	No	No	No

As nouns, biological warfare defense and biological warfare defence are synonyms defined as:

biological warfare defense and biological warfare defence: defense against biological warfare

Other synonyms of biological warfare defense include BW defence, BW defense.

biological warfare defense (noun)	biological warfare defence (noun)
defense against biological warfare	defense against biological warfare