Synonyms and related words :
air lane, air line, axis, beat, beeline, bypass, chord, circuit, course, cut, cutoff, diagonal, diameter, direct line, directrix, edge, flight path, great-circle course, itinerary, line, normal, orbit, path, perpendicular, primrose path, radius, radius vector, right line, road, round, route, run, sea lane, secant, segment, shortest way, side, straight, straight course, straight line, straight stretch, straightaway, streamline, tangent, tour, track, trade route, traject, trajectory, trajet, transversal, vector, walk