deactivation vs defusing

deactivation and defusing both are nouns.

Word	Noun	Adjective	Verb	Adverb
deactivation	Yes	No	No	No
defusing	Yes	No	No	No

As nouns, deactivation and defusing are synonyms defined as:

deactivation and defusing: the act of deactivating or making ineffective (as a bomb)

deactivation (noun)	defusing (noun)
the act of deactivating or making ineffective (as a bomb)	the act of deactivating or making ineffective (as a bomb)
breaking up a military unit (by transfers or discharges)