biodefence vs biodefense

biodefence and biodefense both are nouns.

Word	Noun	Adjective	Verb	Adverb
biodefence	Yes	No	No	No
biodefense	Yes	No	No	No

As nouns, biodefence and biodefense are synonyms defined as:

biodefence and biodefense: procedures involved in taking defensive measures against attacks using biological agents

Other synonyms of biodefence include biological defence, biological defense.

biodefence (noun)	biodefense (noun)
procedures involved in taking defensive measures against attacks using biological agents	procedures involved in taking defensive measures against attacks using biological agents