spectre (US specter)

n (fml 文) 1 ghost; phantom 鬼; 幽灵: haunted by spectres from the past 闹鬼的. 2 unpleasant and frightening mental image of possible future trouble （因可能出现困难而产生的）忧虑, 恐怖: The spectre of unemployment was always on his mind. 他心头一直萦绕著可能失业的恐惧感.

specifically, specification, specificity, specify, specimen, specious, speciously, speciousness, speck, speckle, speckled, specs, spectacle, spectacled, spectacles, spectacular, spectacularly, spectator, spectator sports, spectral, spectro-, spectrometer, spectroscope, spectroscopic, spectrum, speculate, speculate on, speculation, speculation about, speculative, speculator, sped, speech, speech therapist, speech therapy, speech-day, speechify, speechless, speechlessly, speechlessness,