Pool can be used for Relax. Pool is related to Float. Stream is a type of Float. Stream is a type of Course. 
Condition is a type of Better. Ordinary is a type of Condition. Ordinary is the opposite of Divine. 
Relax <--UsedFor-- Pool <--RelatedTo--> Float <--IsA-- Stream --IsA--> Course 
Better <--IsA-- Condition <--IsA-- Ordinary <--Antonym--> Divine 