Indian potato vs tall sunflower

Indian potato and tall sunflower both are nouns.

Word	Noun	Adjective	Verb	Adverb
Indian potato	Yes	No	No	No
tall sunflower	Yes	No	No	No

As nouns, Indian potato and tall sunflower are synonyms defined as:

Indian potato and tall sunflower: very tall American perennial of central and the eastern United States to Canada having edible tuberous roots

Other synonyms of Indian potato include giant sunflower, Helianthus giganteus.

Indian potato (noun)	tall sunflower (noun)
very tall American perennial of central and the eastern United States to Canada having edible tuberous roots	very tall American perennial of central and the eastern United States to Canada having edible tuberous roots
a North American vine with fragrant blossoms and edible tubers; important food crop of Native Americans