Nouns

(n)birchhard close-grained wood of any of various birch trees; used especially in furniture and interior finishes and plywood
(n)birch, birch treeany betulaceous tree or shrub of the genus Betula having a thin peeling bark
(n)birch, birch roda 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”

Verbs

(v)birchwhip with a birch twig

Adjectives

(s)birch, birchen, birkenconsisting of or made of wood of the birch tree