silver berry vs silverberry

silver berry and silverberry both are nouns.

Word	Noun	Adjective	Verb	Adverb
silver berry	Yes	No	No	No
silverberry	Yes	No	No	No

As nouns, silver berry and silverberry are synonyms defined as:

silver berry and silverberry: deciduous unarmed North American shrub with silvery leaves and fruits

Other synonyms of silver berry include Elaeagnus commutata, silver-bush, silverbush.

silver berry (noun)	silverberry (noun)
deciduous unarmed North American shrub with silvery leaves and fruits	deciduous unarmed North American shrub with silvery leaves and fruits
deciduous shrubby tree of Europe and western Asia having grey leaves and small yellow fruits covered in silvery scales; sometimes spiny