tortoise plant vs Dioscorea elephantipes

tortoise plant and Dioscorea elephantipes both are nouns.

Word	Noun	Adjective	Verb	Adverb
tortoise plant	Yes	No	No	No
Dioscorea elephantipes	Yes	No	No	No

As nouns, tortoise plant and Dioscorea elephantipes are synonyms defined as:

tortoise plant and Dioscorea elephantipes: South African vine having a massive rootstock covered with deeply fissured bark

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

tortoise plant (noun)	Dioscorea elephantipes (noun)
South African vine having a massive rootstock covered with deeply fissured bark	South African vine having a massive rootstock covered with deeply fissured bark