Content clause

Near-synonyms: nominal clause, noun clause

The bracketed parts [of the examples given] are like main clauses in some ways, but not in every way: that vaccines work would not be allowed as a main clause; nor would I ever saw it. I’ll call them content clauses from now on, because they express full sentence-like content of their own. […] Traditional grammars tend to call content clauses “noun clauses” because of a feeling that content clauses can serve as subjects and objects of verbs, just like nouns (by which they mean NPs [noun phrases]). It’s not a good parallel (verbs like Think and Inquire take content-clause complements but not NP complements), and I won’t be using the term “noun clause” in this book.