Air is a synonym of Manner. Manner is related to Behavior. Behavior is related to Trouble. Trouble is the opposite of Okay. 
Serve is a type of Help. Serve is a type of Foster. 
Air <--Synonym--> Manner <--RelatedTo--> Behavior <--RelatedTo--> Trouble <--Antonym--> Okay 
Help <--IsA-- Serve --IsA--> Foster 