A Barrow or Burial Mound
This page is the CodyCross answer for the clue below from House of Horrors, Group 1110, Puzzle 4 (Ancient Burial Ground).
Question is: A Barrow or Burial Mound
and the answer is: TUMULUS
Word Meaning:
TUMULUS — (archaeology) A mound of earth, especially one placed over a prehistoric tomb; a barrow.
Definitions from Wiktionary.