Waste is a synonym of Desert. Desert is the opposite of River. River is related to Bank. Bank is related to Coast. 
Bit is a type of Part. Bit is a synonym of Handful. 
Waste <--Synonym--> Desert <--Antonym--> River <--RelatedTo--> Bank <--RelatedTo--> Coast 
Part <--IsA-- Bit <--Synonym--> Handful 