A clause used as a noun is called a Substantive Clause.
a. A Substantive Clause may be used as the Subject or Object of a verb, as an Appositive, or as a Predicate Nominative or Accusative.
J. H. Allen and J. B. Greenough, New Latin Grammar (Boston: Ginn, 1903). Text provided under a CC BY-SA license by Perseus Digital Library, http://www.perseus.tufts.edu, with funding from the National Endowment for the Humanities.
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