When I hear "angle of attack" or AoA, I think of an airplane. Usually, both the airfoil and the plane itself have a clearly defined 'top' and 'bottom'. In this case, the concept of angle of attack is applied in cartesian coordinates, and has a well defined sign convention.
Wikipedia thinks of an airplane also.
For a nominally cylindrically symmetric rocket, this graphic found at https://spaceflightsystems.grc.nasa.gov/education/rocket/rktstab.html uses "displacement angle", which if I understand correctly is applied in spherical coordinates and is therefore generally meant to be positive.
See also Figure 3.15 in Introduction to Rocket Science and Engineering, Travis S. Taylor
A rocket which is flying horizontally for example could have a displacement angle up, down, left, or right, and it would be pretty much identical aerodynamically. Not so for an airplane.
Are these two terms therefore not really interchangeable?
note: my question applies to 'rocket-shaped' rockets only, not car-shaped or plane-shaped rockets or spacecraft.