European elder vs bourtree

European elder and bourtree both are nouns.

Word	Noun	Adjective	Verb	Adverb
European elder	Yes	No	No	No
bourtree	Yes	No	No	No

As nouns, European elder and bourtree are synonyms defined as:

European elder and bourtree: a common shrub with black fruit or a small tree of Europe and Asia; fruit used for wines and jellies

Other synonyms of European elder include black elder, common elder, elderberry, Sambucus nigra.

European elder (noun)	bourtree (noun)
a common shrub with black fruit or a small tree of Europe and Asia; fruit used for wines and jellies	a common shrub with black fruit or a small tree of Europe and Asia; fruit used for wines and jellies