birch rod(n = noun.artifact) birch - 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"
is a kind of switch

N  scourge, rod, cane, stick, ratan, rattan, birch, birch rod, azote, blacksnake, bullwhack, chicote, kurbash, quirt, rawhide, sjambok, rod in pickle, switch, ferule, cudgel, truncheon, whip, bullwhip, lash, strap, thong, cowhide, knout, cat, cat o'nine tails, rope's end, pillory, stocks, whipping post, cucking stool, ducking stool, brank, trebuchet, trebuket, triangle, wooden horse, iron maiden, thumbscrew, boot, rack, wheel, iron heel, chinese water torture, treadmill, crank, galleys, scaffold, block, ax, guillotine, stake, cross, gallows, gibbet, tree, drop, noose, rope, halter, bowstring, death chair, electric chair, gas chamber, lethal injection, firing squad, mecate, house of correction, goaler, jailer, executioner, electrocutioner, lyncher, hangman, headsman, Jack Ketch.

aaron's rod, american dwarf birch, american gray birch, american grey birch, american white birch, birch, birch bark, birch beer, birch family, birch leaf miner, birch oil, birch tree, black birch, black rod, canoe birch, cherry birch, common birch, connecting rod, control rod, divining rod, downy birch, dowsing rod, drill rod, european white birch, fishing rod, fly rod, gauging rod, gray birch, grey birch, hot rod, jacob's rod, lightning rod, measuring rod, mountain birch, newfoundland dwarf birch, paper birch, paperbark birch, piston rod, red birch, retinal rod, river birch, rod, rod cell, rod laver, silver birch, spinning rod, swamp birch, sweet birch, tappet rod, tie rod, water birch, western birch, western paper birch, white birch, yellow birch, yukon white birch