Are there incorrect vocab words on WK? How best to supplement vocab with other sources?

[Kumirei]

There are plenty of such decks available. Check out the ones on the resource wiki

The Ultimate Additional Japanese Resources List!

This post is a list of Japanese resources and stands as a collaborative wiki gathered by the WaniKani Community. If there’s a resource you feel is missing from the list, please add it by clicking the edit button above. Include an edit reason by clicking the button at the top of the edit window. Many of the resources here are free, however, the ones that aren’t are marked with a dollar sign $ or otherwise noted. Click on the triangle symbol ► to open a section’s resou…