scarlet plume vs Euphorbia fulgens

scarlet plume and Euphorbia fulgens both are nouns.

Word	Noun	Adjective	Verb	Adverb
scarlet plume	Yes	No	No	No
Euphorbia fulgens	Yes	No	No	No

As nouns, scarlet plume and Euphorbia fulgens are synonyms defined as:

scarlet plume and Euphorbia fulgens: Mexican shrub often cultivated for its scarlet-bracted flowers

scarlet plume (noun)	Euphorbia fulgens (noun)
Mexican shrub often cultivated for its scarlet-bracted flowers	Mexican shrub often cultivated for its scarlet-bracted flowers