Hear is related to Use. Use is a synonym of Employment. 
Okay is related to Right. Right is a synonym of Correct. Correct is related to Fact. Fact is the opposite of Fiction. 
Hear <--RelatedTo--> Use <--Synonym--> Employment 
Okay <--RelatedTo--> Right <--Synonym--> Correct <--RelatedTo--> Fact <--Antonym--> Fiction 