Boat is related to Movement. Movement is related to Nod. Nod is related to Action. 
Big is related to Crowd. Crowd is related to Little. Little is related to Evening. Evening is the opposite of Early. 
Boat <--RelatedTo--> Movement <--RelatedTo--> Nod <--RelatedTo--> Action 
Big <--RelatedTo--> Crowd <--RelatedTo--> Little <--RelatedTo--> Evening <--Antonym--> Early 