Hottentot bread vs Hottentot's bread

Hottentot bread and Hottentot's bread both are nouns.

Word	Noun	Adjective	Verb	Adverb
Hottentot bread	Yes	No	No	No
Hottentot's bread	Yes	No	No	No

As nouns, Hottentot bread and Hottentot's bread are synonyms defined as:

Hottentot bread and Hottentot's bread: thick edible rootstock of elephant's-foot

Hottentot bread (noun)	Hottentot's bread (noun)
thick edible rootstock of elephant's-foot	thick edible rootstock of elephant's-foot