hijab: a headscarf worn by Muslim women; conceals the hair and neck and usually has a face veil that covers the face
headscarf: a kerchief worn over the head and tied under the chin
pyramid scheme: a fraudulent scheme in which people are recruited to make payments to the person who recruited them while expecting to receive payments from the persons they recruit; when the number of new recruits fails to sustain the hierarchical payment structure the scheme collapses with most of the participants losing the money they put in