  It has recently been demonstrated that it is possible to open a gap in a
magnetic Weyl semimetal, while preserving the chiral anomaly along with the
charge conservation and translational symmetries, which all protect the gapless
nodes in a weakly interacting semimetal. The resulting state was shown to be a
nontrivial generalization of a nonabelian fractional quantum Hall liquid to
three dimensions. Here we point out that a second fractional quantum Hall state
exists in this case. This state has exactly the same electrical and thermal
Hall responses as the first, but a distinct (fracton) topological order.
Moreover, the existence of this second fractional quantum Hall state
necessarily implies a gapless phase, which has identical topological response
to a noninteracting Weyl semimetal, but is distinct from it. This may be viewed
as a generalization (in a weaker form) of the known duality between a
noninteracting two-dimensional Dirac fermion and QED$_3$ to $3+1$ dimensions.
In addition we discuss a $(3+1)$-dimensional topologically ordered state,
obtained by gapping a nodal line semimetal without breaking symmetries.
