an imaginary place or state in which everything is perfect (Oxford)
a perfect society in which people work well with each other and are happy (Cambridge)
Try and imagine a perfect society, a utopia, in which the government really got everything right. (Cambridge)
Humans, in the developed world at least, are as close to utopia as they are ever likely to be, argues the professor. (Cambridge)
perfect society, a utopia
developed world, close to utopia
Paradise
Dreamworld
Hell
Utopian