India has at least 14 languages and many are used to describe the same thing. Bindi is the Hindi word for it, Bindhu is the Sanskrit word I believe. Kunkum I believe is Sanskrit (describing the red powder itself), and Pottu is Tamil. So Sindoor could be another language too.
Sorry that did not exactly answer your question.
7yo: "Mom,I know which man is on a quarter and which on is on a nickel. They both have ponytails, but one man has a collar and the other man is naked. The naked man was our first president."