Kindle's Vocabulary Builder, for example, ... If your firmware is equal to higher than 5.4.4, you should have the Vocabulary Builder feature in some form or another on your device.

All products featured here are independently selected by our editors and writers. If you buy something through links on our site, Mashable may earn an affiliate commission. Credit: Pexels Deal ...

Vocabulary Builder, made by Magoosh, gives you sets of vocabulary words culled from the SAT, GRE and TOEFL to help you prepare for those tests. Of course, you can also just look at it as a fun ...