This is the 396th most frequent Slovak word.
rusko
The Slovak word "rusko" can mean "mask" (e.g., face mask) or "Russia," depending on context.
Here 'Rusko' is used as a proper noun, referring to the country Russia.
Rusko je veľká krajina.
Russia is a large country.
In this context, 'ruško' is used as a common noun meaning 'mask,' typically a face-covering mask as part of a costume.
Na karnevale sme mali pekné ruško.
At the carnival, we had a nice mask.
Here, 'rúško' refers to a medical or protective face mask, indicating its use in health and safety contexts.