Estimated is a form of Estimate. Estimated is the opposite of Actual. Actual is the opposite of Pretend. one thing you do when you Pretend is Act. 
Sentence is the opposite of Word. 
Estimate <--FormOf-- Estimated <--Antonym--> Actual <--Antonym--> Pretend --HasSubevent--> Act 
Sentence <--Antonym--> Word 