impasse vs situation

impasse and situation both are nouns.

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

As nouns, situation is a hypernym of impasse; that is, situation is a word with a broader meaning than impasse:

impasse: a situation in which no progress can be made or no advancement is possible
situation: a complex or critical or unusual difficulty

impasse (noun)	situation (noun)
a street with only one way in or out	a job in an organization
a situation in which no progress can be made or no advancement is possible	physical position in relation to the surroundings
	the general state of things; the combination of circumstances at a given time
	a condition or position in which you find yourself
	a complex or critical or unusual difficulty