Old is related to Ancient. Ancient is related to Cave. you are likely to find Entrance in/at/on Cave. 
Kid is a synonym of Child. Child is a type of Person. Person does not want (to) Trip. Bus can be used for Trip. 
Old <--RelatedTo--> Ancient <--RelatedTo--> Cave <--AtLocation-- Entrance 
Kid <--Synonym--> Child --IsA--> Person --NotDesires--> Trip <--UsedFor-- Bus 