Great iPhone apps for vocabulary?

I'm looking for an app that I can use to quiz myself on vocabulary words, preferably ones that I search and then save for future refreshment. If anyone knows of any really great apps for vocab testing, that would be great.

Try either of the two:

1. Dictionary (https://itunes.apple.com/us/app/id294553522?mt=8)

2. Vocabulary Daily Free - Word of the Day (https://itunes.apple.com/us/app/id289937035?mt=8)

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