Some synonyms for the word "counterfeit" include the words imitation, fake, forged, phony, bogus, sham, etc.
falsification
You could use fake, copied, or spurious.
The closest synonym would be counterfeit.
false, fake, counterfeit artificial, forged, imitation, sham, fraudulent
mimic, ridicule, deride, imitate, copy, counterfeit, impersonate, spoof, parody, insult, taunt, tease, make fun of
artificial, bogus, copied, counterfeit, fake, false, imitation, manufactured, phony, pretended, sham, simulated, spurious, substitute, synthetic.
synthetic, manufactured, plastic, man-made, non-natural, phoney, fake, mock, imitation, bogus, sham, counterfeit
It is an uncontrolled variable that causes differences on the dependent variable beyond the independent variable (e.g. personality, age, etc.)
Counterfeit IslandNo, Counterfeit Island is real. In fact, it'd be better named as "Art Island".
Counterfeit Economy is basically describing counterfeit items being sold and purchased.
Counterfeit can be used as an adjective (counterfeit money), a noun (counterfeits), and a verb (to counterfeit).
there is no mansion on counterfeit island