Bottom is a synonym of Butt. Butt is related to Leg. 
Parental is related to Dad. Dad is related to Man. Man is related to Chest. Chest is related to Lung. 
Bottom <--Synonym--> Butt <--RelatedTo--> Leg 
Parental <--RelatedTo--> Dad <--RelatedTo--> Man <--RelatedTo--> Chest <--RelatedTo--> Lung 