Ymer is a Danish word that refers to a type of cultured dairy product. It is similar to yogurt and is made from fermented milk. However, if you are looking for synonyms for the word "ymer," then you might consider other yogurt-like products from around the world. For example, skyr is a traditional Icelandic dairy product that is similar to ymer. Kefir is a fermented milk drink that is popular in Eastern Europe. Labneh is a Middle Eastern dairy product that is made by straining yogurt to remove the whey. Greek yogurt is another popular yogurt-like product that is thicker and creamier than traditional yogurt.