Cellar; Room or Rooms Beneath the Ground Floor
This page is the CodyCross answer for the clue below from Larger than Life, Group 2160, Puzzle 1 (Megalodons).
Question is: Cellar; Room or Rooms Beneath the Ground Floor
and the answer is: BASEMENT
Word Meaning:
BASEMENT — (architecture) A floor of a building below ground level.
Definitions from Wiktionary.