  We give evidence for 3d bosonization in Conformal Field Theories (CFTs) by
computing monopole operator scaling dimensions in 2+1 dimensional quantum
electrodynamics (QED3) with Chern-Simons level $k$ and $N$ complex bosons in a
large $N,k$ expansion. We first consider the $k=0$ case, where we show that
scaling dimensions previously computed to subleading order in $1/N$ can be
extrapolated to $N=1$ and matched to $O(2)$ Wilson-Fisher CFT scaling
dimensions with around 5\% error, which is evidence for particle-vortex
duality. We then generalize the subleading calculation to large $N,k$ and fixed
$k/N$, extrapolate to $N=k=1$, and consider monopole operators that are
conjectured to be dual to non-degenerate scalar operators in a theory of a
single Dirac fermion. We find matches typically with 1\% error or less, which
is strong evidence of this so-called `seed' duality that implies a web of 3d
bosonization dualities among CFTs.
