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We demonstrate that recent experimental data (E. Castel et al J.Phys. Cond.Mat. {\bf 21} (2009), 452201) on tungsten bronze compound (TBC)Ba$_2$Pr$_x$Nd$_{1-x}$FeNb$_4$O$_{15}$ can be well explained in our modelpredicting a crossover from ferroelectric ($x=0$) to orientational (dipole)glass ($x=1$), rather then relaxor, behavior. We show, that since a "classical"perovskite relaxor like Pb(Mn$_{1/3}$ Nb$_{2/3}$)O$_3$ is never aferroelectric, the presence of ferroelectric hysteresis loops in TBC shows thatthis substance actually transits from ferroelectric to orientational glassphase with $x$ growth. To describe the above crossover theoretically, we usethe simple replica-symmetric solution for disordered Ising model.

Tetragonal tungsten bronze compounds: relaxor vs mixed ferroelectric - dipole glass behavior