Sorry is related to Ride. Boat is a type of Ride. Boat is related to Activity. Laughter is a type of Activity. 
Handful is a synonym of Little. Little is the opposite of Lot. Lot is a type of River. 
Sorry <--RelatedTo--> Ride <--IsA-- Boat <--RelatedTo--> Activity <--IsA-- Laughter 
Handful <--Synonym--> Little <--Antonym--> Lot --IsA--> River 