mongrel vs pariah dog

mongrel and pariah dog both are nouns.

Word	Noun	Adjective	Verb	Adverb
mongrel	Yes	No	No	No
pariah dog	Yes	No	No	No

As nouns, pariah dog is a hyponym of mongrel; that is, pariah dog is a word with a more specific, narrower meaning than mongrel:

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

Other hyponyms of mongrel include feist, fice, pie-dog, pye-dog.

mongrel (noun)	pariah dog (noun)
an inferior dog or one of mixed breed	ownerless half-wild mongrel dog common around Asian villages especially India
derogatory term for a variation that is not genuine; something irregular or inferior or of dubious origin