pye-dog vs cur

pye-dog and cur both are nouns.

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

As nouns, cur is a hypernym of pye-dog; that is, cur is a word with a broader meaning than pye-dog:

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

Other hypernyms of pye-dog include mongrel, mutt.

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