Nominalist

A forbidden word.

A nominalist, in the antiquated sense, is someone who believes that the laws of nature are figments of a person's imagination. In that sense, they are purely arbitrary. Reality, itself, to the nominalist, has no such laws governing it. The idea of nominalism arose when philosophers noticed that not all humans (or dogs, or cats or horses) are exactly alike, and that it is deucedly difficult to define precisely what a human being is, so they stopped trying and tried to explain why it was rational to stop trying.

Eventually, they got carried away with not trying to explain what things actually were, which made the study of sub-atomic particles a tad arcane, in their view.

Today, the only things nominalists and realists agree on is that not all philosophies are alike.