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In the context of anti-cellular catalytic permutations, the development of thermally-induced nanotechnology is of great importance. In this study, iron oxides (Fe₂O₃) decorated silver (Ag) core–shell nanocomposite was prepared using a green thermal decomposition process without using any additional chemicals. The nanocomposite was characterized for its composition, phase interactions, morphology, and stability using spectroscopic, thermogravimetric, and microscopic techniques. The resultant nanocomposite were also investigated against different types of bacteria and cancer cell lines. Both Gram-positive bacteria (Staphylococcus aureus) and Gram-negative bacteria (Klebsiella spp., E. coli, and Pseudomonas) growth was inhibited by the Ag/Fe₂O₃ nanocomposite. The highest 19 mm zone of inhibition (ZOI) was found for Staphylococcus aureus by the combined effect of Ag and Fe₂O₃. The antibiofilm efficacy …