pie-dog vs cur

pie-dog and cur both are nouns.

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

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

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

Other hypernyms of pie-dog include mongrel, mutt.

pie-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