Which term is not listed as a type of isomer in the material?

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The idea to understand is that isomerism is grouped into broad categories: structural (different connectivity), cis-trans (geometric arrangement around double bonds or rings), and optical (molecules that exist as non-superimposable mirror images). An enantiomer is one member of a pair within optical isomerism—the two mirror-image forms. Because enantiomers are specific forms, not a separate category, the material would list optical isomerism as a category and enantiomers as the forms that fall under that umbrella. So the term that isn’t listed as its own type is enantiomer.