If referring to the act of polishing:
* Polishes (e.g., "She gave the furniture several polishes.")
If referring to a substance used for polishing:
* Polishes (e.g., "He used different polishes for the different types of wood.")
If referring to people from Poland:
* Poles (e.g., "Many Poles immigrated to the United States in the early 20th century.")
Let me know if you have any other words you'd like to know the plural of!