Ruso
Ruso is the Spanish term for “Russian” and is used as both an adjective and a noun. As an adjective, it describes anything related to Russia, its people, language, or culture, for example, literatura rusa or comida rusa. As a noun, it refers to a person from Russia: un ruso (masculine) or una rusa (feminine). The plural forms are rusos and rusas.
Gender and agreement: When describing a group, rusos is used for mixed or male-dominated groups, while rusas
Cuisine and common uses: A well-known culinary use of the term is ensalada rusa, commonly called Russian
Other uses: Outside nationality or cuisine, ruso can appear in proper names or historical references to Russia.