tear gas vs lachrymator

tear gas and lachrymator both are nouns.

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

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

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

Other synonyms of tear gas include lacrimator, teargas.

tear gas (noun)	lachrymator (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