Front is a type of Position. Position is a synonym of Perspective. 
Actual is the opposite of Estimated. Estimated is derived from Estimate. Estimate is related to Price. Price is related to Quantity. 
Front --IsA--> Position <--Synonym--> Perspective 
Actual <--Antonym--> Estimated --DerivedFrom--> Estimate <--RelatedTo--> Price <--RelatedTo--> Quantity 