What is a antonym for obelisk?

An antonym is an "opposite name" such as small and big are antonyms.

A synonym is a "together name" such as small and little are synonyms.

An obelisk is a 4-sided stone pillar.

Synonyms include column, monolith, monument, pillar, pylon, tower.

There are no listed antonyms for the Word obelisk.