sweetbriar vs rosebush

sweetbriar and rosebush both are nouns.

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

As nouns, rosebush is a hypernym of sweetbriar; that is, rosebush is a word with a broader meaning than sweetbriar:

sweetbriar: Eurasian rose with prickly stems and fragrant leaves and bright pink flowers followed by scarlet hips
rosebush: any of many shrubs of the genus Rosa that bear roses

Other hypernyms of sweetbriar include rose.

sweetbriar (noun)	rosebush (noun)
Eurasian rose with prickly stems and fragrant leaves and bright pink flowers followed by scarlet hips	any of many shrubs of the genus Rosa that bear roses