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Related resources
   WordAndPhrase
   Word frequency
   Collocates
   N-grams

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In addition to the regular corpus interface, there are a wide range of other corpus-based resources, some of which allow you to download large amounts of data for offline use.
 

Word and Phrase
(analyze texts)

Enter entire texts and see detailed frequency information on the words in the text, and create word lists based on your text. Click through the words to see detailed information on any word. Highlight phrases in your text and have it search for related phrases in COCA.

Word and Phrase
(frequency lists)

Search and browse the most complete frequency dictionary of English. See detailed information (all on one page) -- definition, frequency by genre, collocates (nearby words), concordance lines, synonyms, and Wordnet-related words, all with useful links from one resource to another.

Word Frequency
100,000 list

Download free lists, including the top 5000 lemmas. You can also download other lists, which show the frequency of the top 60,000 lemmas by genre (and sub-genre). And now you can download the new 100,000 integrated word list from COCA, COHA, BNC, and SOAP -- the largest, corrected frequency list of English.

Collocates

Download lists with the top 200-300 collocates (nearby words) for 60,000 different lemmas -- 4,300,000 node/collocate pairs in all.

N-grams

Download free lists containing the top 1,000,000 2-grams (two word sequences), 3-grams, 4-grams, and 5-grams in COCA. There are also other lists that contain the frequency of all 2, 3, and 4-grams (up to 155 million rows of data).

Word and Phrase
(academic)

Similar to the two resources above, but limited strictly to the 120 million words of academic texts in COCA. Get detailed information on words and phrases, frequency by sub-genre (e.g. Law, Medicine, Science, Business, Humanities), and concordances and collocates in just the academic text.

Academic Words

Download free lists containing academic words grouped by word family, as well as lists of "core" academic English, and "technical" word lists for the nine sub-genres of academic.