Smile is related to Say. Say is related to Describe. Describe is related to Function. Function is related to Act. 
Favor is the opposite of Balance. Tension is a type of Balance. 
Smile <--RelatedTo--> Say <--RelatedTo--> Describe <--RelatedTo--> Function <--RelatedTo--> Act 
Favor <--Antonym--> Balance <--IsA-- Tension 