biodefence vs biological defense

biodefence and biological defense both are nouns.

Word	Noun	Adjective	Verb	Adverb
biodefence	Yes	No	No	No
biological defense	Yes	No	No	No

As nouns, biodefence and biological defense are synonyms defined as:

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

Other synonyms of biodefence include biodefense, biological defence.

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