biological defense vs biodefense

biological defense and biodefense both are nouns.

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

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

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

Other synonyms of biological defense include biodefence, biological defence.

biological defense (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