cur vs pye-dog

cur and pye-dog both are nouns.

Word	Noun	Adjective	Verb	Adverb
cur	Yes	No	No	No
pye-dog	Yes	No	No	No

As nouns, pye-dog is a hyponym of cur; that is, pye-dog is a word with a more specific, narrower meaning than cur:

cur: an inferior dog or one of mixed breed
pye-dog: ownerless half-wild mongrel dog common around Asian villages especially India

Other hyponyms of cur include feist, fice, pariah dog, pie-dog.

cur (noun)	pye-dog (noun)
an inferior dog or one of mixed breed	ownerless half-wild mongrel dog common around Asian villages especially India
a cowardly or contemptible person