
1) Adam
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https://www.crosswordclues.com/clue/powell

1) Boog of the Orioles 2) Colin Luther or Adam Clayton 3) Colin luther powell 4) Colin powell 5) Dick or jane 6) Explorer of Colorado River 7) Full general 8) General 9) Gulf War general 10) National leader 11) Nobel Prize physicist, 1950 12) Oriole Boog 13) Rice served after him 14) Solon 15) Statesman
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https://www.crosswordclues.com/clue/powell

city, Park county, northwestern Wyoming, U.S., on the Shoshone River. Founded as a ranching centre in the Powder River basin, a predominantly ...
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http://www.britannica.com/eb/a-z/p/103

Seminole leader; see
Osceola. ...
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http://www.encyclo.co.uk/local/20688

[
n] - English physicist who discovered the pion (the first known meson) which is a subatomic particle involved in holding the nucleus together (1903-1969)
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http://www.webdictionary.co.uk/definition.php?query=Powell

Synonym (also Ruff Heath) for the grape variety Delaware; see there. Delaware (grape variety) The white grape variety comes from the USA. Synonyms are Delavar, Delavar Rozovii, Delavar Serii, Delawar, Delaware Piros, Fehér Delaware, Gray Delaware, Heath Grape, Ladies Choice, Piros Delaware, Powell, Rose Colored Delaware, Ruff and Ruff Heath. ...
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https://glossary.wein.plus/powell
Cecil Frank Powell noun English physicist who discovered the pion (the first known meson) which is a subatomic particle involved in holding the nucleus together (1903-1969)
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https://www.encyclo.co.uk/local/20974
No exact match found.