Cool is the opposite of Close. Snap is a type of Close. 
Tone is a type of Interval. Tone is related to Volume. Volume is related to Water. Water is the opposite of Milk. 
Cool <--Antonym--> Close <--IsA-- Snap 
Interval <--IsA-- Tone <--RelatedTo--> Volume <--RelatedTo--> Water <--Antonym--> Milk 