  A nonuniversal abelian extension $\mathrm{U(1)}_{X}$ free from chiral
anomalies is introduced into the Standard Model (SM), in order to evaluate its
suitability in addressing the fermion mass hierarchy (FMH) by using seesaw
mechanisms (SSM). In order to break the electroweak symmetry, three Higgs
doublets are introduced, which give mass at tree-level to the top and bottom
quarks, and the muon lepton. With an electroweak singlet scalar field, the
$U(1)_{X}$ symmetry is broken and the exotic particles acquire masses. The
light particles in the SM obtain their masses via SSM and Yukawa couplings
differences. Active neutrino masses are generated through inverse seesaw
mechanisms (ISM). Additionally, the algebraic expressions for the mixing angles
for quarks and leptons are also shown in the article.
  Keywords: Flavor Problem, Neutrino Physics, Extended Scalar Sectors, Beyond
Standard Model, Fermion masses, Inverse seesaw Mechanism.
