biodefence vs biological defence

biodefence and biological defence both are nouns.

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

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

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

Other synonyms of biodefence include biodefense, biological defense.

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