nitrochloromethane vs tear gas

nitrochloromethane and tear gas both are nouns.

Word	Noun	Adjective	Verb	Adverb
nitrochloromethane	Yes	No	No	No
tear gas	Yes	No	No	No

As nouns, tear gas is a hypernym of nitrochloromethane; that is, tear gas is a word with a broader meaning than nitrochloromethane:

nitrochloromethane: gaseous form of chloropicrin used as tear gas
tear gas: a gas that makes the eyes fill with tears but does not damage them; used in dispersing crowds

Other hypernyms of nitrochloromethane include lachrymator, lacrimator, teargas.

nitrochloromethane (noun)	tear gas (noun)
gaseous form of chloropicrin used as tear gas	a gas that makes the eyes fill with tears but does not damage them; used in dispersing crowds