The author and his wife recently watched a course on language that mentioned a giant word database called the Corpus of Historical American English (COHA). It is a scholar's tool as well as an engaging treasury for word lovers of all kinds. It's effortless and fun to use on an amateur level, and it has cool linguistic jargon such as "lemma", "collocate", and "n-gram". COHA has a sister corpus, the Corpus of Contemporary American English (COCA), which covers more modern texts than COHA. COHA and COCA are based on large scanned collections of American English texts from the past 202 years.
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