Here, we compare the structural, dielectric, magnetic, and adsorption properties of two series of Zn 1-x RE x O nanoparticles (NPs) with x ≤ 0.20 and RE = Er or Nd. The majority of structural metrics are raised against x up to 0.10 in all NPs samples; however, they are higher for the Nd samples. The opposite behavior is also true for the ac electrical conductivity and dielectric constant against x, although they are higher for the Er samples. The quality factor, impedance, and series resistance are significantly increased against x, whereas the equivalent capacitance was decreased, such that they are higher for the Nd samples. The ZnO NPs exhibited poor ferro magnetic behavior of saturated magnetization (M s ) of 0.018 (emu/g). In contrast, the RE-doped ZnO NPs show ferromagnetic behavior such that the highest values of Ms (0.514 and 0.463 emu/g) obtained at x = 0.10 for Er and Nd. Furthermore, the RE ions shift the ZnO NPs from soft to hard magnetic materials along with high values of all magnetic parameters. Moreover, the ZnO NPs had the highest switching field distribution (SFD) of 60.95 Oe, whereas the incorporation of Er or Nd in the ZnO NPs induced a further reduction in SFD to 5.31 or 10.56 Oe. The 0.10 Er NPs showthe highest values of surface area (SA) and dye removal (DR%) of 63.22 m 2 /g and 72.07 %, respectively, whereas the lowest values of 38.89 m the 0.10 Nd NPs (51.95 m 2 2 /g and 59.49 % were obtained for ZnO NPs, and meanwhile /g and 63.77 %). This investigation paves the way for the original of RTFM in the RE doped ZnO NPs and is a promising candidate for some of the more advanced devices.