nonchalance vs indifference

nonchalance and indifference both are nouns.

Word	Noun	Adjective	Verb	Adverb
nonchalance	Yes	No	No	No
indifference	Yes	No	No	No

As nouns, nonchalance and indifference are synonyms defined as:

nonchalance and indifference: the trait of remaining calm and seeming not to care; a casual lack of concern

Other synonyms of nonchalance include unconcern.

nonchalance (noun)	indifference (noun)
the trait of remaining calm and seeming not to care; a casual lack of concern	the trait of lacking enthusiasm for or interest in things generally
	the trait of remaining calm and seeming not to care; a casual lack of concern
	unbiased impartial unconcern
	apathy demonstrated by an absence of emotional reactions