protective covering vs watch crystal

Other hyponyms of protective covering include armor, armour, bell glass, bell jar, binder, ring-binder, back, binding, book binding, cover, blind, screen, armguard, bracer, cap, cloche, coaster, cold frame, crystal, watch glass, dust cover, faceplate, cladding, facing, fall-board, fallboard, escutcheon, finger plate, scutcheon, heat shield, bonnet, cowl, cowling, hood, housing, lamp shade, lampshade, shade, liner, lining, mask, mulch, roof, roof, screen, shade, sheath, overlay, overlayer, sheathing, shelter, shield, dashboard, splashboard, splasher, splasher, testudo, thumbstall, toecap, splashboard, washboard.