I am a conceptual nominalist, which I explain to some extent here. One of my favourite images to explain this is below. Also good for explaining the species problem, which reflects or exemplifies the nominalism/realism debate.
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Jonathan MS Pearce
A TIPPLING PHILOSOPHER Jonathan MS Pearce is a philosopher, author, columnist, and public speaker with an interest in writing about almost anything, from skepticism to science, politics, and morality,... More by Jonathan MS Pearce