Is there a word to describe having good command of the English language? The kind of word that could be listed as an attribute?
closed as general reference by MετάEd, FumbleFingers, cornbread ninja 麵包忍者, Rory Alsop, Zairja Oct 19 '12 at 20:37
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There is not a unique word to describe this. If the person only has a good command of English, the simplest is "functional in English". If that is not strong enough, go with "fluent".
Have you already thought to "mastery" ("n. Full command of a subject of study: Her mastery of economic theory impressed the professors. n. Expert knowledge or skill; power of using or exercising; dexterity: as, the mastery of an art or science.")?
Reading the above definitions, it seems you could say something like this: "Do you have mastery of English language?" or "Her mastery of English language impressed the professors."