pye-dog vs mutt

pye-dog and mutt both are nouns.

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

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

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

Other hypernyms of pye-dog include cur, mongrel.

pye-dog (noun)	mutt (noun)
ownerless half-wild mongrel dog common around Asian villages especially India	an inferior dog or one of mixed breed