Synonyms for Woadwaxen (same or very similar meaning)
WordNet sense 1 (small Eurasian shrub having clusters of yellow flowers that yield a dye; common as weed in England and United States; sometimes grown as an ornamental):
dyer's-broom, dyeweed, greenweed, whin, woodwaxen, dyer's greenweed, Genista tinctoriaFrom the ODE community, based on WordNetadd/edit