biodefense vs biological defense

biodefense and biological defense both are nouns.

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

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

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

Other synonyms of biodefense include biodefence, biological defence.

biodefense (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