Just got this app. Enjoying it so far, but I already have a minor suggestion. The "Family" category completely glosses over whether the word given is used in relation to ones own family or to anothers family. For instance, the differences between "otousan" and "chichi" or "okaasan" and "haha" are sort of important. Please consider fixing this as I have to keep referring to another app if Im not sure which is which.
Also, do I really get a splash screen ad nagging me every time I return to the app? Not cool.
Other than that, Im enjoying it, especially the sound files. This is where apps shine over books, in my opinion. I may never buy another language book again.