home-fried potatoes vs murphy

home-fried potatoes and murphy both are nouns.

Word	Noun	Adjective	Verb	Adverb
home-fried potatoes	Yes	No	No	No
murphy	Yes	No	No	No

As nouns, murphy is a hypernym of home-fried potatoes; that is, murphy is a word with a broader meaning than home-fried potatoes:

home-fried potatoes: sliced pieces of potato fried in a pan until brown and crisp
murphy: an edible tuber native to South America; a staple food of Ireland

Other hypernyms of home-fried potatoes include Irish potato, potato, spud, tater, white potato.

home-fried potatoes (noun)	murphy (noun)
sliced pieces of potato fried in a pan until brown and crisp	an edible tuber native to South America; a staple food of Ireland