Supplantment refers to the act of replacing or displacing something or someone from a position or rank. Its antonyms are predominantly positive words that connote stability, constancy, and steadfastness. The antonyms for supplantment include preservation, maintenance, retention, continuity, and perpetuity. Preservation refers to the act of saving or keeping something in its original condition or form. Maintenance, on the other hand, implies the act of upkeep, repair, and proper care of something to keep it functioning correctly. Retention conveys the idea of preserving something or someone in their place, while Continuity suggests the uninterrupted or continuous existence of something or someone. Finally, Perpetuity refers to the everlasting existence or continuity of something without end.