partridgeberry vs twinberry

partridgeberry and twinberry both are nouns.

Word	Noun	Adjective	Verb	Adverb
partridgeberry	Yes	No	No	No
twinberry	Yes	No	No	No

As nouns, partridgeberry and twinberry are synonyms defined as:

partridgeberry and twinberry: creeping woody plant of eastern North America with shiny evergreen leaves and scarlet berries

Other synonyms of partridgeberry include boxberry, Mitchella repens.

partridgeberry (noun)	twinberry (noun)
creeping woody plant of eastern North America with shiny evergreen leaves and scarlet berries	shrubby honeysuckle with purple flowers; western North America
	creeping woody plant of eastern North America with shiny evergreen leaves and scarlet berries