indifference vs nonchalance

indifference and nonchalance both are nouns.

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

As nouns, indifference and nonchalance are synonyms defined as:

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

Other synonyms of indifference include unconcern.

indifference (noun)	nonchalance (noun)
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
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