One of the main focus of Japanese Words has always been about learning new Japanese words. In the beginning you need to know a certain number of words to communicate in Japanese and as you get to a more advanced level you will need to more words to express more complex ideas and feelings.
Today I stumbled across a site that has a number of common Japanese words such as numbers, colors, common Japanese phrases, animals, and other Japanese vocabulary. They also have sound.
Good luck and let me know what you think!