The following hierarchical chart shows about 1000 subcategories in the ImageNet. 
Fig.1. ImageNet Classification Hierarchy (source: https://observablehq.com/@mbostock/imagenet-hierarchy)
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The following hierarchical chart shows about 1000 subcategories in the ImageNet.
Fig.1. ImageNet Classification Hierarchy (source: https://observablehq.com/@mbostock/imagenet-hierarchy)