In systematic nomenclature, the suffix -carbonitrile is used to name compounds
RC≡N
where the suffix includes the carbon atom of the
–CN. However, carbonitrile is not a class name for
nitriles.
Source:
PAC, 1995, 67, 1307
(Glossary of class names of organic compounds and reactivity intermediates based on
structure (IUPAC Recommendations 1995))
on page 1325