sweet corn vs corn

sweet corn and corn both are nouns.

Word	Noun	Adjective	Verb	Adverb
sweet corn	Yes	No	No	No
corn	Yes	No	Yes	No

As nouns, corn is a hypernym of sweet corn; that is, corn is a word with a broader meaning than sweet corn:

sweet corn: corn that can be eaten as a vegetable while still young and soft
corn: ears of corn that can be prepared and served for human food

Other hypernyms of sweet corn include edible corn.

As nouns, corn is a hypernym of sweet corn; that is, corn is a word with a broader meaning than sweet corn:

sweet corn: a corn plant developed in order to have young ears that are sweet and suitable for eating
corn: tall annual cereal grass bearing kernels on large ears: widely cultivated in America in many varieties; the principal cereal in Mexico and Central and South America since pre-Columbian times

Other hypernyms of sweet corn include Indian corn, maize, Zea mays.

sweet corn (noun)	corn (noun)
corn that can be eaten as a vegetable while still young and soft	something sentimental or trite
a corn plant developed in order to have young ears that are sweet and suitable for eating	ears of corn that can be prepared and served for human food
	whiskey distilled from a mash of not less than 80 percent corn
	tall annual cereal grass bearing kernels on large ears: widely cultivated in America in many varieties; the principal cereal in Mexico and Central and South America since pre-Columbian times
	(Great Britain) any of various cereal plants (especially the dominant crop of the region--wheat in Great Britain or oats in Scotland and Ireland)
	the dried grains or kernels or corn used as animal feed or ground for meal
	a hard thickening of the skin (especially on the top or sides of the toes) caused by the pressure of ill-fitting shoes

sweet corn (verb)	corn (verb)
	preserve with large-grained rock salt
	feed (cattle) with corn