Other hyponyms of protective cover 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 crystal,
watch glass,
dust cover,
faceplate,
cladding,
facing,
fall-board,
fallboard,
escutcheon,
finger plate,
scutcheon,
heat shield,
bonnet,
cowl,
cowling,
hood,
housing,
lamp shade,
shade,
liner,
lining,
mask,
mulch,
roof,
roof,
screen,
shade,
sheath,
overlay,
overlayer,
sheathing,
shelter,
shield,
dashboard,
splashboard,
splasher,
splasher,
testudo,
thumbstall,
toecap,
splashboard,
washboard.