Synonyms for Napkin (same or very similar meaning)
WordNet sense 1 (a small piece of table linen that is used to wipe the mouth and to cover the lap in order to protect clothing):
serviette, table napkinWordNet sense 2 (garment consisting of a folded cloth drawn up between the legs and fastened at the waist; worn by infants to catch excrement):
diaper, nappyFrom the ODE community, based on WordNetadd/edit