Hope Smith wrote:I am looking for open source built-in dictionary to use it in my code
Hi Hope, and welcome to JavaRanch.
My suggestion would be to SearchFirst (←click). A quick Google of "Java open source english dictionary" got me a pile of hits. If you then have a question about a specific OS dictionary, you're much more likely to get a good response.
Bats fly at night, 'cause they aren't we. And if we tried, we'd hit a tree -- Ogden Nash (or should've been).
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