birch

hard close-grained wood of any of various birch trees; used especially in furniture and interior finishes and plywood

any betulaceous tree or shrub of the genus Betula having a thin peeling bark

a switch consisting of a twig or a bundle of twigs from a birch tree; used to hit people as punishment; "my father never spared the birch"

whip with a birch twig

consisting of or made of wood of the birch tree