9 letters · 13 points in Scrabble
noun a hardy breed of saddle horse developed in western North America and characteristically having a spotted rump
originFrom a + Palouse + -a. From the phrase "a Palouse horse", referring to the Palouse River near which they were first encountered by non-Native Americans. The river is named for the Palouse region.
Etymology from Wiktionary, CC BY-SA 3.0