Fever is related to Temperature. Temperature is related to Warmth. Warmth is the opposite of Cold. 
Talk is the opposite of Yell. Yell is similar to Shout. Shout is related to Volume. 
Fever <--RelatedTo--> Temperature <--RelatedTo--> Warmth <--Antonym--> Cold 
Talk <--Antonym--> Yell <--SimilarTo--> Shout <--RelatedTo--> Volume 