sleuth
1. [ verb ] watch, observe, or inquire secretly
Synonyms: spy snoop stag
Related terms: monitor spy snoop spying investigate
2. [ noun ] (work) a detective who follows a trail
Synonyms: sleuthhound
Related terms: detective spy
Similar spelling:   Sleeth
  slut
  sloth
  sleet
  sleety
  slot
  slit
  slat
  Sloat
  slide
  slate
  Slade