There are many Native American languages and therefore many Native American words for any particular word in English. When you ask a question about how to say something in "Native American", you have to pick a particular language.
There is no such language as "Native American". There are hundreds of different tribes and languages among the different groups of Native Americans. You can read more about them and their languages at the related link.
well, you can say either one. i prefer saying native americans,but i also say american indians. The reason why most americans today call them just plain indians is because christipher columbus thought he had sailed to india.