IPA: //haɪˈpoʊdʒiːəm//
KK: /haɪˈpoʊdʒiːəm/
A room or chamber that is located underground, often used in ancient times for burial or as part of a building.
The archaeologists discovered an ancient hypogeum filled with artifacts.
Hypogeum → It is formed from "hypo-" (from Greek "hypo", meaning under or below) and "geō" (from Greek "gē", meaning earth). The word refers to an underground structure or burial site, literally meaning 'under the earth'.
Think of 'under' ('hypo-') and 'earth' ('geō') to remember that a hypogeum is something located beneath the earth.
No commonly confused words.