elephant's-foot vs tortoise plant

elephant's-foot and tortoise plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
elephant's-foot	Yes	No	No	No
tortoise plant	Yes	No	No	No

As nouns, elephant's-foot and tortoise plant are synonyms defined as:

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

Other synonyms of elephant's-foot include Dioscorea elephantipes, Hottentot's bread vine, Hottentot bread vine.

elephant's-foot (noun)	tortoise plant (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