CN gas vs Mace

CN gas and Mace both are nouns.

Word	Noun	Adjective	Verb	Adverb
CN gas	Yes	No	No	No
Mace	Yes	No	No	No

As nouns, Mace is a hyponym of CN gas; that is, Mace is a word with a more specific, narrower meaning than CN gas:

CN gas: a tear gas that is weaker than CS gas but lasts longer
Mace: (trademark) a liquid that temporarily disables a person; prepared as an aerosol and sprayed in the face, it irritates the eyes and causes dizziness and immobilization

Other hyponyms of CN gas include Chemical Mace.

CN gas (noun)	Mace (noun)
a tear gas that is weaker than CS gas but lasts longer	(trademark) a liquid that temporarily disables a person; prepared as an aerosol and sprayed in the face, it irritates the eyes and causes dizziness and immobilization