Bad is the opposite of Quality. Quality is related to Reliability. 
Beef is a synonym of Complain. Protest is a type of Complain. Protest is related to Police. Police is a synonym of Cop. 
Bad <--Antonym--> Quality <--RelatedTo--> Reliability 
Beef <--Synonym--> Complain <--IsA-- Protest <--RelatedTo--> Police <--Synonym--> Cop 