English words first attested in Chaucer, or special manuscript words of Chaucer, are a set of about two thousand English words whose first use found in existing manuscripts is credited to Geoffrey Chaucer. This does not necessarily mean that he was the person to introduce these words into English, but that the earliest extant uses of these words are found in Chaucerian manuscripts. Many of the words were already in everyday speech in 14th-century England (especially London). The claim is that these words are found for the first time in written manuscripts where he introduced them in one of his extensive works from 1374 to 1400 as the first author to use these particular words. Many of Chaucer's special manuscript words are used today: absent, accident, add, agree, bagpipe, border, box, cin