Japan has a tradition of adopting words from other languages. However there are a lot many original Japanese words which we many times do not know.
Yamato Kotoba (大和言葉) are such ancient Japanese words. Here Yamato is an ancient name of Japan.

[video=youtube;Yoy-zfgTD6A]https://www.youtube.com/watch?v=Yoy-zfgTD6A&feature=related[/video]