vocabulary or vocabularies
Please use the Red book for more vocabularies. Have the students learn the new vocabularies.
1 answer 
i) Please use the Red book to expand your vocabulary.
ii) Have the students study the new chapters on vocabulary.
Vocabulary is one's repertoire or lexicon of words, and is used in the singular noun sense. On the other hand, the word "Dictionary" - a collection of words, in alphabetical order, with their meanings, in a book - can be used in the singular or plural sense.
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answered Oct 19 '11 at 14:50
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