Yucca elata vs soap-weed

Yucca elata and soap-weed both are nouns.

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

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

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

Other synonyms of Yucca elata include soap tree, soapweed.

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