Get is a type of Destroy. Get is a synonym of Have. Have is related to Employ. Employ is the opposite of Sack. 
Sale is a type of Agreement. Agreement is related to Pay. Pay is related to Salary. 
Destroy <--IsA-- Get <--Synonym--> Have <--RelatedTo--> Employ <--Antonym--> Sack 
Sale --IsA--> Agreement <--RelatedTo--> Pay <--RelatedTo--> Salary 