11 letters · 25 points in Scrabble
noun small (2-4 inches) pugnacious mostly scaleless spiny-backed fishes of northern fresh and littoral waters having elaborate courtship; subjects of much research
originFrom dialectal stickle (“a prickle, spine, sting”), from Old English sticel + bæc. See stick (transitive verb) and compare banstickle.
Etymology from Wiktionary, CC BY-SA 3.0