mongrel vs feist

mongrel and feist both are nouns.

Word	Noun	Adjective	Verb	Adverb
mongrel	Yes	No	No	No
feist	Yes	No	No	No

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

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

mongrel (noun)	feist (noun)
an inferior dog or one of mixed breed	a nervous belligerent little mongrel dog
derogatory term for a variation that is not genuine; something irregular or inferior or of dubious origin