impasse vs standstill

impasse and standstill both are nouns.

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

As nouns, impasse and standstill are synonyms defined as:

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

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

impasse (noun)	standstill (noun)
a street with only one way in or out	an interruption of normal activity
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