It is very easy to tell the difference between a sword and an anubia. An anubia will have a rhizome which is horizontal and is pencil like in shape. Leaves then sprout along the top of the rhizome and white roots grown from the bottom of the rhizome. Swords just have roots and leaves. They are very different looking. Also when swords are happy they can sprout leaves very quickly where as anubia's are slow growing.