spectre
n. countable C1 Advanced US //ˈspɛktɝ// UK //spˈɛktɐ// spec·tre
n. the idea of something unpleasant or scary that might happen in the future. It can also mean a ghost or a spirit.
n. a haunting or disturbing image of a future possibility, typically something unpleasant or dangerous; also refers to a ghost or phantom.
The spectre of war hung over the region.
Economists warned that the spectre of inflation could derail the country's fragile recovery.
Even as the treaty was signed, the spectre of past betrayals loomed large in the minds of the negotiators, preventing any real sense of trust from forming.
Usage
Often used metaphorically with 'of' to describe a persistent fear or threat.