starches vs potato

starches and potato both are nouns.

Word	Noun	Adjective	Verb	Adverb
starches	Yes	No	No	No
potato	Yes	No	No	No

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

starches: foodstuff rich in natural starch (especially potatoes, rice, bread)
potato: an edible tuber native to South America; a staple food of Ireland

Other hyponyms of starches include bread, breadstuff, staff of life, Irish potato, murphy, spud, tater, white potato, rice.

starches (noun)	potato (noun)
foodstuff rich in natural starch (especially potatoes, rice, bread)	an edible tuber native to South America; a staple food of Ireland
	annual native to South America having underground stolons bearing edible starchy tubers; widely cultivated as a garden vegetable; vines are poisonous