One who discovers; the person who discovered something.(noun)
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Use "discoverer" in a sentence
"On the podium of the digital revolution, he stands a few inches clear of Bill Gates of Microsoft, Larry Page and Sergey Brin of Google and Mark Zuckerberg of Facebook, but probably on a level with Tim Berners Lee, the inventor of the worldwide web actually I prefer the word discoverer because it now seems almost impossible to believe that the web was not out there waiting to be found."
"He abhors the word discoverer, as applied to himself."
"Burrough therefore is often called the discoverer of Novaya Zemlya, but incorrectly."