whin

(noun) very spiny and dense evergreen shrub with fragrant golden-yellow flowers; common throughout western Europe. Synonyms: gorse, furze, Irish gorse, Ulex europaeus.

(noun) small Eurasian shrub having clusters of yellow flowers that yield a dye; common as a weed in Britain and the United States; sometimes grown as an ornamental. Synonyms: woodwaxen, dyer's greenweed, dyer's-broom, dyeweed, greenweed, woadwaxen, Genista tinctoria.

(noun) any of various hard colored rocks (especially rocks consisting of chert or basalt). Synonyms: whinstone.