Help with name

I am looking for help with a name that means Snow Fox or White Fox. Does anyone know how to put that together please? Sindarin would be preferred.

Here:

• Lothrusc "Snow-fox"
  (The initial element is actually loss "snow" but it is changed due to the "s(s)+r=thr" rule and thus can be misunderstood as loth "flower".)

• Nimrusc "White-fox"

I think I like Nimrusc better. How is rusc pronounced, if you don't mind me asking?