deadlock vs stalemate

deadlock and stalemate both are nouns.

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

As nouns, deadlock and stalemate are synonyms defined as:

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

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

deadlock (noun)	stalemate (noun)
a situation in which no progress can be made or no advancement is possible	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

deadlock (verb)	stalemate (verb)
	subject to a stalemate