  We report the creation of ultracold bosonic dipolar
$^{23}\textrm{Na}^{39}\textrm{K}$ molecules in their absolute rovibrational
ground state. Starting from weakly bound molecules immersed in an ultracold
atomic mixture, we coherently transfer the dimers to the rovibrational ground
state using an adiabatic Raman passage. We analyze the two-body decay in a pure
molecular sample and in molecule-atom mixtures and find an unexpectedly low
two-body decay coefficient for collisions between molecules and
$^{39}\textrm{K}$ atoms in a selected hyperfine state. The preparation of
bosonic $^{23}\textrm{Na}^{39}\textrm{K}$ molecules opens the way for future
comparisons between fermionic and bosonic ultracold ground-state molecules of
the same chemical species.
