1.  silverbush(n = noun.plant) anthyllis barba-jovis, jupiter's beard, silver-bush - silvery hairy European shrub with evergreen foliage and pale yellow flowers;
is a kind of bush, shrub
is a member of anthyllis, genus anthyllis

2.  silverbush(n = noun.plant) elaeagnus commutata, silver berry, silver-bush, silverberry - deciduous unarmed North American shrub with silvery leaves and fruits;
is a kind of oleaster