cranberry bush vs highbush cranberry

cranberry bush and highbush cranberry both are nouns.

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

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

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

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

cranberry bush (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