impasse vs stalemate

impasse and stalemate both are nouns.

Word	Noun	Adjective	Verb	Adverb
impasse	Yes	No	No	No
stalemate	Yes	No	Yes	No

As nouns, impasse and stalemate are synonyms defined as:

impasse and stalemate: a situation in which no progress can be made or no advancement is possible

Other synonyms of impasse include dead end, deadlock, standstill.

impasse (noun)	stalemate (noun)
a street with only one way in or out	drawing position in chess: any of a player's possible moves would place his king in check
a situation in which no progress can be made or no advancement is possible	a situation in which no progress can be made or no advancement is possible

impasse (verb)	stalemate (verb)
	subject to a stalemate