Ok is the opposite of Bad. Bad is related to Smoke. Smoke is a type of Use. 
Scientist is a type of Magazine. Scientist is a type of Researcher. Analyst is a type of Researcher. 
Ok <--Antonym--> Bad <--RelatedTo--> Smoke --IsA--> Use 
Magazine <--IsA-- Scientist --IsA--> Researcher <--IsA-- Analyst 