Guider
/ˈɡaɪdər/
Definition 1 of 2
Pro Tip 1/3Person or Object
Remember 'guider' can refer to a person who leads or an object that directs. 
A compass can act as a guider in the woods.
Pro Tip 2/3Metaphorical Use
'Guider' may be used metaphorically to describe a source of wisdom or inspiration. 
His mentor was a guider in his spiritual journey.
Pro Tip 3/3Human Guidance
'Guider' emphasizes active, thoughtful guidance by someone with more knowledge or experience. 
She acted as a guider for the new interns.