elephant's-foot vs Dioscorea elephantipes

elephant's-foot and Dioscorea elephantipes both are nouns.

Word	Noun	Adjective	Verb	Adverb
elephant's-foot	Yes	No	No	No
Dioscorea elephantipes	Yes	No	No	No

As nouns, elephant's-foot and Dioscorea elephantipes are synonyms defined as:

elephant's-foot and Dioscorea elephantipes: South African vine having a massive rootstock covered with deeply fissured bark

Other synonyms of elephant's-foot include Hottentot's bread vine, Hottentot bread vine, tortoise plant.

elephant's-foot (noun)	Dioscorea elephantipes (noun)
any plant of the genus Elephantopus having heads of blue or purple flowers; America	South African vine having a massive rootstock covered with deeply fissured bark
South African vine having a massive rootstock covered with deeply fissured bark