Ostentation rhymes with:
argumentation, augmentation, documentation, implementation, misrepresentation, orientation, ornamentation, regimentation, representation, argumentation, augmentation, confrontation, disorientation, documentation, experimentation, fermentation, fragmentation, implantation, implementation, incantation, indentation, instrumentation, misrepresentation, orientation, ornamentation, pigmentation, plantation, presentation, recantation, regimentation, representation, sedimentation, segmentation, transplantation