Nouns

(n)black-footed ferret, ferret, Mustela nigripesmusteline mammal of prairie regions of United States; nearly extinct
(n)ferretdomesticated albino variety of the European polecat bred for hunting rats and rabbits

Verbs

(v)ferrethound or harry relentlessly
(v)ferrethunt with ferrets
(v)ferret out, ferretsearch and discover through persistent investigation“She ferreted out the truth”