Corpus of Contemporary American English (COCA) | L2 Vocabulary Teaching & Learning | Scoop.it

450 million word corpus of American English, 1990-2012. Compare to the BNC and ANC. Large, balanced, up-to-date, and freely-available online.

COCA can be searched to find collocates of specific vocabulary words. It also provides frequency data on the use of specific words, which can aid in lesson planning.