  The next-to-minimal supersymmetric standard model (NMSSM) with an extended
Higgs sector offers one of the Higgs boson as the Standard model (SM) like
Higgs with a mass around 125 GeV along with other Higgs bosons with lighter and
heavier masses and not excluded by any current experiments. At the LHC,
phenomenology of these non SM like Higgs bosons is very rich and considerably
different from the other supersymmetric models. In this work, assuming one of
the Higgs bosons to be the SM like, we revisit the mass spectrum and couplings
of non SM like Higgs bosons taking into consideration all existing constraints
and identify the relevant region of parameter space. The discovery potential of
these non SM like Higgs bosons, apart from their masses, is guided by their
couplings with gauge bosons and fermions which are very much parameter space
sensitive. We evaluate the rates of productions of these non SM like Higgs
bosons at the LHC for a variety of decay channels in the allowed region of the
parameter space. Although bb, {\tau}{\tau} decay modes appear to be the most
promising, it is observed that for a substantial region of parameter space the
two-photon decay mode has a remarkably large rate. In this work we emphasize
that this diphoton mode can be exploited to find the NMSSM Higgs signal and can
also be potential avenue to distinguish the NMSSM from the MSSM. In addition,
we discuss briefly the various detectable signals of these non SM Higgs bosons
at the LHC.
