chemical warfare vs chemical operations

chemical warfare and chemical operations both are nouns.

Word	Noun	Adjective	Verb	Adverb
chemical warfare	Yes	No	No	No
chemical operations	Yes	No	No	No

As nouns, chemical warfare and chemical operations are synonyms defined as:

chemical warfare and chemical operations: warfare using chemical agents to kill or injure or incapacitate the enemy

chemical warfare (noun)	chemical operations (noun)
warfare using chemical agents to kill or injure or incapacitate the enemy	warfare using chemical agents to kill or injure or incapacitate the enemy