Know is a synonym of Live. Live is a synonym of Be. Tend is a type of Be. 
Sort is a synonym of Character. Character is the opposite of Real. Real is similar to Serious. Serious is the opposite of Game. 
Know <--Synonym--> Live <--Synonym--> Be <--IsA-- Tend 
Sort <--Synonym--> Character <--Antonym--> Real <--SimilarTo--> Serious <--Antonym--> Game 