Extra is a type of Company. Company is related to Employer. 
Lid is related to Can. Can is the opposite of Unable. Unable is the opposite of Possible. Possible is related to Ability. 
Extra --IsA--> Company <--RelatedTo--> Employer 
Lid <--RelatedTo--> Can <--Antonym--> Unable <--Antonym--> Possible <--RelatedTo--> Ability 