Part is related to Sail. Sail is related to Activity. Activity is related to Born. 
Elderly is derived from Elder. Elder is the opposite of Baby. Baby is related to Small. 
Part <--RelatedTo--> Sail <--RelatedTo--> Activity <--RelatedTo--> Born 
Elderly --DerivedFrom--> Elder <--Antonym--> Baby <--RelatedTo--> Small 