Silk is related to Origin. Origin is related to Egg. Egg is related to Scramble. 
Climb is related to Exercise. Exercise is related to Walk. Stumble is a type of Walk. 
Silk <--RelatedTo--> Origin <--RelatedTo--> Egg <--RelatedTo--> Scramble 
Climb <--RelatedTo--> Exercise <--RelatedTo--> Walk <--IsA-- Stumble 