chemical operations vs chemical warfare

chemical operations and chemical warfare both are nouns.

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

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

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

chemical operations (noun)	chemical warfare (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