is a specific kind of: activity.

is a broader term that covers: camouflage, disguise | mask | cover, covering, masking, screening | cover | cover-up | burial, burying | smoke screen, smokescreen | stealing, stealth | money laundering.

derivation: blot out, hide, obliterate, obscure, veil | conceal, hide | conceal, hold back, hold in.

is the opposite of: revealing.