Seaweed products are widely used in many cultures for a variety of purposes. AGAR, with four letters, is a jelly-like substance derived from seaweed and used in cooking, as a thickener for soups, and as a gelling agent for desserts. Iodine, with six letters, is an essential mineral found in some types of seaweed and is used to treat thyroid disorders. Agaragar, with eight letters, is a type of seaweed product made from AGAR and used as a vegan substitute for gelatin.