What are words or phrases that have a foreboding tone in the Masque of the red death?

In Edgar Allan Poe's "The Masque of the Red Death," phrases such as "the Red Death," "blood," and "darkness" evoke a foreboding tone, symbolizing the inevitability of death. The description of the "scarlet stains" and the eerie, oppressive atmosphere of the uninviting castle enhance the sense of dread. Additionally, the ominous "clock of ebony" striking the hour serves as a grim reminder of mortality, creating an ever-present tension throughout the narrative.