Is polish a common noun

The noun polish is a common noun, as in "I am going to use some polish." The Word polish is also a verb, as in "I will polish my shoes."

The noun Polish is a proper noun as a Word for the language of Poland, "They speak English and Polish." A proper noun is always capitalized. As an adjective, Polish is a proper adjective as in "They are a Polish family." A proper adjective is always capitalized.