cranberry tree vs highbush cranberry

cranberry tree and highbush cranberry both are nouns.

Word	Noun	Adjective	Verb	Adverb
cranberry tree	Yes	No	No	No
highbush cranberry	Yes	No	No	No

As nouns, cranberry tree and highbush cranberry are synonyms defined as:

cranberry tree and highbush cranberry: deciduous North American shrub or small tree having three-lobed leaves and red berries

Other synonyms of cranberry tree include American cranberry bush, cranberry bush, Viburnum trilobum.

cranberry tree (noun)	highbush cranberry (noun)
deciduous North American shrub or small tree having three-lobed leaves and red berries	deciduous North American shrub or small tree having three-lobed leaves and red berries
deciduous thicket-forming Old World shrub with clusters of white flowers and small bright red berries