Which resource is best for vocabulary enrichment?

The resource that is best for vocabulary enrichment is vocabulary.com because it is specifically designed to enhance users' vocabulary skills. This website provides personalized vocabulary practice through interactive games, quizzes, and targeted feedback, allowing users to learn new words in context. It also features a rich database of words along with definitions, usage examples, and synonyms, which can help learners understand and remember new vocabulary more effectively.

In contrast, the other options focus on different subject areas. For instance, aaamath.com focuses on math skills, edhelper.com provides a variety of educational resources across subjects but isn't exclusively dedicated to vocabulary, and mathleague.com specializes in math competitions and practice. These resources, while valuable for their respective subjects, do not prioritize vocabulary development in the way that vocabulary.com does.