a person who shows others the way, especially a person employed to point out interesting sights on a journey or visit
something that or someone who leads
Cases of word usage
1) a floating object, anchored to the bottom of the sea used to guide ships, to indicate reefs, submerged wrecks etc (buoy)
2) a narrow country road; a marked division of a road to guide motorists (lane)
3) a short sentence or phrase used as a guide or rule of behaviour, as used by a school, club etc or expressed as a personal rule of conduct (motto)
4) a rule or guide for behaviour (precept)