mask
noun
1 she wore a mask to conceal her face:
disguise, veil, false face, domino, stocking mask, fancy dress;
historical visor;
archaic vizard.
2 wear a mask to avoid inhaling dust:
face mask, protective mask, face covering, face shield;
surgical mask, medical mask, gas mask, oxygen mask, fencing mask, iron mask, ski mask, dust mask;
safety goggles, welding goggles, welding mask, eye mask, visor.