situation vs crisis

situation and crisis both are nouns.

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

As nouns, crisis is a hyponym of situation; that is, crisis is a word with a more specific, narrower meaning than situation:

situation (noun)	crisis (noun)
a job in an organization	a crucial stage or turning point in the course of something
physical position in relation to the surroundings	an unstable situation of extreme danger or difficulty
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