Travel is the opposite of Home. Home is related to Sweet. Sweet is related to Gentle. Gentle is related to Calm. 
Rock is related to Age. Age is related to Reason. Reason is a synonym of Understanding. Understanding is related to Insight. 
Travel <--Antonym--> Home <--RelatedTo--> Sweet <--RelatedTo--> Gentle <--RelatedTo--> Calm 
Rock <--RelatedTo--> Age <--RelatedTo--> Reason <--Synonym--> Understanding <--RelatedTo--> Insight 