in private vs in camera

in private and in camera both are adverbs.

Word	Noun	Adjective	Verb	Adverb
in private	No	No	No	Yes
in camera	No	No	No	Yes

As adverbs, in private and in camera are synonyms defined as:

in private and in camera: kept private or confined to those intimately concerned

Other synonyms of in private include privately.

in private (adverb)	in camera (adverb)
kept private or confined to those intimately concerned	kept private or confined to those intimately concerned