butterfly bush vs buddleia

butterfly bush and buddleia both are nouns.

Word	Noun	Adjective	Verb	Adverb
butterfly bush	Yes	No	No	No
buddleia	Yes	No	No	No

As nouns, butterfly bush and buddleia are synonyms defined as:

butterfly bush and buddleia: tropical shrub having clusters of white or violet or yellow flowers

butterfly bush (noun)	buddleia (noun)
tropical shrub having clusters of white or violet or yellow flowers	tropical shrub having clusters of white or violet or yellow flowers