slim chance vs probability

slim chance and probability both are nouns.

Word	Noun	Adjective	Verb	Adverb
slim chance	Yes	No	No	No
probability	Yes	No	No	No

As nouns, probability is a hypernym of slim chance; that is, probability is a word with a broader meaning than slim chance:

slim chance: little or no chance of success
probability: a measure of how likely it is that some event will occur; a number expressing the ratio of favorable cases to the whole number of cases possible

Other hypernyms of slim chance include chance.

slim chance (noun)	probability (noun)
little or no chance of success	the quality of being probable; a probable event or the most probable event
	a measure of how likely it is that some event will occur; a number expressing the ratio of favorable cases to the whole number of cases possible