bourtree vs black elder

bourtree and black elder both are nouns.

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

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

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

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

bourtree (noun)	black elder (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