soap-weed vs Yucca elata

soap-weed and Yucca elata both are nouns.

Word	Noun	Adjective	Verb	Adverb
soap-weed	Yes	No	No	No
Yucca elata	Yes	No	No	No

As nouns, soap-weed and Yucca elata are synonyms defined as:

soap-weed and Yucca elata: tall arborescent yucca of southwestern United States

Other synonyms of soap-weed include soap tree, soapweed.

soap-weed (noun)	Yucca elata (noun)
tall arborescent yucca of southwestern United States	tall arborescent yucca of southwestern United States