context vs circumstance

context and circumstance both are nouns.

Word	Noun	Adjective	Verb	Adverb
context	Yes	No	No	No
circumstance	Yes	No	No	No

As nouns, context and circumstance are synonyms defined as:

context and circumstance: the set of facts or circumstances that surround a situation or event

Other synonyms of context include setting.

context (noun)	circumstance (noun)
discourse that surrounds a language unit and helps to determine its interpretation	information that should be kept in mind when making a decision
the set of facts or circumstances that surround a situation or event	formal ceremony about important occasions
	a condition that accompanies or influences some event or activity
	the set of facts or circumstances that surround a situation or event