guelder rose vs Viburnum opulus

guelder rose and Viburnum opulus both are nouns.

Word	Noun	Adjective	Verb	Adverb
guelder rose	Yes	No	No	No
Viburnum opulus	Yes	No	No	No

As nouns, guelder rose and Viburnum opulus are synonyms defined as:

guelder rose and Viburnum opulus: deciduous thicket-forming Old World shrub with clusters of white flowers and small bright red berries

Other synonyms of guelder rose include crampbark, cranberry tree, European cranberry bush, European cranberrybush.

guelder rose (noun)	Viburnum opulus (noun)
deciduous thicket-forming Old World shrub with clusters of white flowers and small bright red berries	deciduous thicket-forming Old World shrub with clusters of white flowers and small bright red berries