There are a lot of different approaches to learning English vocabulary. In general, I'd encourage you to adopt an approach that emphasizes the sense of pattern and structure in our lexicon. One such approach is described in some detail in the Short Articles section of this website, under the title "Words and Some of Their Ways." It's a rewrite of a talk given some years ago to teachers of English in Japan. As a followup to it, you might look at the short article "On Dictionaries" on this website.
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