Fun can be Free. Free is the opposite of Fate. Fate is related to Outcome. Outcome is related to Experiment. 
Hide is the opposite of Uncover. Uncover is a synonym of Discover. Discover is related to Invention. 
Fun --HasProperty--> Free <--Antonym--> Fate <--RelatedTo--> Outcome <--RelatedTo--> Experiment 
Hide <--Antonym--> Uncover <--Synonym--> Discover <--RelatedTo--> Invention 