= Superfield covariance is not Grassmann dependence alone
A <superfield> is a field on <superspace> with a specified <Super-Poincaré group> transformation law. Being a polynomial in anticommuting coordinates alone does not specify this law or make coefficients a <supermultiplet>. Conversely, a suitably graded function on full <superspace>, acted on by coordinate pullback, is an unconstrained scalar superfield. A polynomial with spacetime-independent coefficients can be a special constant-component <chiral superfield>; dependence on spacetime is not itself the defining criterion. Chirality and reality impose additional conditions.
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