Japanese rose vs baby rose

Japanese rose and baby rose both are nouns.

Word	Noun	Adjective	Verb	Adverb
Japanese rose	Yes	No	No	No
baby rose	Yes	No	No	No

As nouns, Japanese rose and baby rose are synonyms defined as:

Japanese rose and baby rose: vigorously growing rose having clusters of numerous small flowers; used for hedges and as grafting stock

Other synonyms of Japanese rose include multiflora, multiflora rose, Rosa multiflora.

Japanese rose (noun)	baby rose (noun)
vigorously growing rose having clusters of numerous small flowers; used for hedges and as grafting stock	vigorously growing rose having clusters of numerous small flowers; used for hedges and as grafting stock