dwarf buckeye vs bottlebrush buckeye

dwarf buckeye and bottlebrush buckeye both are nouns.

Word	Noun	Adjective	Verb	Adverb
dwarf buckeye	Yes	No	No	No
bottlebrush buckeye	Yes	No	No	No

As nouns, dwarf buckeye and bottlebrush buckeye are synonyms defined as:

dwarf buckeye and bottlebrush buckeye: a spreading shrub with pink flowers; found in southeastern United States

dwarf buckeye (noun)	bottlebrush buckeye (noun)
a spreading shrub with pink flowers; found in southeastern United States	a spreading shrub with pink flowers; found in southeastern United States