  Singlet-paired coupled cluster doubles (CCD0) is a simplification of CCD that
relinquishes a fraction of dynamic correlation in order to be able to describe
static correlation. Combinations of CCD0 with density functionals that recover
specifically the dynamic correlation missing in the former have also been
developed recently. Here, we assess the accuracy of CCD0 and CCD0+DFT (and
variants of these using Brueckner orbitals) as compared to well-established
quantum chemical methods for describing ground-state properties of singlet
actinide molecules. The $f^0$ actinyl series (UO$_2^{2+}$, NpO$_2^{2+}$,
PuO$_2^{2+}$), the isoelectronic NUN, and Thorium (ThO, ThO$^{2+}$) and
Nobelium (NoO, NoO$_2$) oxides are studied.
