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Suber & Thorpe: An English Homophone Dictionary
This website provides a simple definition of homophone as well as a very long list of homophones, organized alphabetically.
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Homophone.com: Dew, Do, Due
Explore the homophone words of dew, do, and due to better understand their meanings.
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Bob's Byway: Glossary of Poetic Terms
Calling itself "unique," Bob's is easy to use, with cross-links throughout, phonetic pronunciation guides when necessary, and many examples and quotations. Click on the letter and scroll for the word.