Decalage is a French word that means displacement of two temperatures or measurements; also absence of concordance between two things.

Hence, it can be used in both cases, where two angles diverge.

I would like to add to the above discussion that stabs fly within the downwash produced by the wing (not for canard layouts); therefore, they normally have negative AOA (producing negative lift that compensates for wing's pitch moment), even when the incidence angle is set as neutral.