polecat vs Mustela putorius

polecat and Mustela putorius both are nouns.

Word	Noun	Adjective	Verb	Adverb
polecat	Yes	No	No	No
Mustela putorius	Yes	No	No	No

As nouns, polecat and Mustela putorius are synonyms defined as:

polecat and Mustela putorius: dark brown mustelid of woodlands of Eurasia that gives off an unpleasant odor when threatened

Other synonyms of polecat include fitch, foulmart, foumart.

polecat (noun)	Mustela putorius (noun)
dark brown mustelid of woodlands of Eurasia that gives off an unpleasant odor when threatened	dark brown mustelid of woodlands of Eurasia that gives off an unpleasant odor when threatened
American musteline mammal typically ejecting an intensely malodorous fluid when startled; in some classifications put in a separate subfamily Mephitinae