alien, apparent, border, circumference, cortex, cortical, covering, crust, envelope, epidermic, epidermis, exomorphic, exotic, exterior, extraneous, extraorganismal, extrinsic, facade, face, facet, foreign, fringe, front, impersonal, integument, lineaments, nonsubjective, objective, open, out, outer, outer face, outer layer, outer side, outer skin, outermost, outline, outlying, outmost, outside, outstanding, outward, outward-facing, over, perceptible, peripheral, periphery, public, rind, roundabout, seeming, shell, skin, superficial, superficies, superstratum, surface, top, visible