lachrymator vs tear gas

lachrymator and tear gas both are nouns.

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

As nouns, lachrymator and tear gas are synonyms defined as:

lachrymator and tear gas: a gas that makes the eyes fill with tears but does not damage them; used in dispersing crowds

Other synonyms of lachrymator include lacrimator, teargas.

lachrymator (noun)	tear gas (noun)
a gas that makes the eyes fill with tears but does not damage them; used in dispersing crowds	a gas that makes the eyes fill with tears but does not damage them; used in dispersing crowds