Solidago spathulata vs narrow goldenrod

Solidago spathulata and narrow goldenrod both are nouns.

Word	Noun	Adjective	Verb	Adverb
Solidago spathulata	Yes	No	No	No
narrow goldenrod	Yes	No	No	No

As nouns, Solidago spathulata and narrow goldenrod are synonyms defined as:

Solidago spathulata and narrow goldenrod: western American goldenrod with long narrow clusters of small yellow flowers

Solidago spathulata (noun)	narrow goldenrod (noun)
western American goldenrod with long narrow clusters of small yellow flowers	western American goldenrod with long narrow clusters of small yellow flowers