rosebush vs multiflora

rosebush and multiflora both are nouns.

Word	Noun	Adjective	Verb	Adverb
rosebush	Yes	No	No	No
multiflora	Yes	No	No	No

As nouns, multiflora is a hyponym of rosebush; that is, multiflora is a word with a more specific, narrower meaning than rosebush:

rosebush: any of many shrubs of the genus Rosa that bear roses
multiflora: vigorously growing rose having clusters of numerous small flowers; used for hedges and as grafting stock

rosebush (noun)	multiflora (noun)
any of many shrubs of the genus Rosa that bear roses	vigorously growing rose having clusters of numerous small flowers; used for hedges and as grafting stock