"ferret" in the noun sense
1. black-footed ferret, ferret, Mustela nigripes
musteline mammal of prairie regions of United States nearly extinct
2. ferret
domesticated albino variety of the European polecat bred for hunting rats and rabbits
"ferret" in the verb sense
1. ferret
hound or harry relentlessly
2. ferret
hunt with ferrets
3. ferret out, ferret
search and discover through persistent investigation
"She ferreted out the truth"
Source: WordNet® (An amazing lexical database of English)
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