7 letters · 17 points in Scrabble
noun vertical space available to allow easy passage under something
noun forward movement
originPartly from Middle English hauedwei, from Old English hēafodweġ (“head-road, main-road”); partly as a shortening of ahead-way, the source of the nautical sense. By surface analysis, head + way.
Etymology from Wiktionary, CC BY-SA 3.0