soapweed vs Yucca elata

soapweed and Yucca elata both are nouns.

Word	Noun	Adjective	Verb	Adverb
soapweed	Yes	No	No	No
Yucca elata	Yes	No	No	No

As nouns, soapweed and Yucca elata are synonyms defined as:

soapweed and Yucca elata: tall arborescent yucca of southwestern United States

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

soapweed (noun)	Yucca elata (noun)
tall arborescent yucca of southwestern United States	tall arborescent yucca of southwestern United States