Casey here distinguishes a few important terms in the ontology space: Taxonomy, Ontology, Knowledge Graph, and Semantics.
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0:00 Intro
0:40 Taxonomy: Hierarchies for classifications
2:10 Ontology: What AI needs to know to 'understand' your data
3:24 Knowledge Graph: Basically ontology, maybe leaning towards data
4:25 Semantics: Data + Understanding
7:22 Summary
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Also, in looking at taxonomies, I stumbled across this video breaking down video game genres: https://www.youtube.com/watch?v=3YZJS6gggXA